Control.Invoke must be used to interact with controls created on a seperate thread - C# Discussion Boards

In that case, you have a few problems. The first is that you are assuming that all parameters are the one character long. The second is that your GetParameters method has no way to know what types you need. You need to get the parameter types from your MethodInfo and pass them into the function. Once you have that, you can use the more general Convert.ChangeType to create the right type of object.

Also, for readability's sake, why are you using param.SetValue(item, index) instead of just param(index) = item?

Hi all...

when i try to run the SendTcpSynExample.cs i face many errors (nearly 23),
like this
Error 1 The best overloaded method match for 'Tamir.IPLib.Packets.TCPPacket.TCPPacket(int, byte[], Tamir.IPLib.Packets.Util.Timeval)' has some invalid arguments C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 70 29 ConsoleApplication1
Error 2 Argument '3': cannot convert from 'bool' to 'Tamir.IPLib.Packets.Util.Timeval' C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 70 56 ConsoleApplication1
Error 3 Property or indexer 'Tamir.IPLib.Packets.EthernetPacket.SourceHwAddress' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 73 13 ConsoleApplication1

and other errors................

.. Can any one help me to solve them?? Sniff | :^)

Thanks to all... Wink | ;)

Lesson 1: Read and understand!

Error 1 The best overloaded method match for 'Tamir.IPLib.Packets.TCPPacket.TCPPacket(int, byte[], Tamir.IPLib.Packets.Util.Timeval)' has some invalid arguments C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 70 29 ConsoleApplication1

What could this mean? Maybe this "has some invalid arguments" could help!
-> your call to Tamir.IPLib.Packets.TCPPacket.TCPPacket has some invalid arguments.
So I would start there to look for your error!

Next step:
"Tamir.IPLib.Packets.TCPPacket.TCPPacket(int, byte[], Tamir.IPLib.Packets.Util.Timeval)"

-> int, byte[], Tamir.IPLib.Packets.Util.Timeval

This are the parameters the compiler expects. So how to solve?
Just give him what he wants!

Greetings
Covean

Hi all...

when i try to run the SendTcpSynExample.cs i face many errors (nearly 23),
like this
Error 1 The best overloaded method match for 'Tamir.IPLib.Packets.TCPPacket.TCPPacket(int, byte[], Tamir.IPLib.Packets.Util.Timeval)' has some invalid arguments C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 70 29 ConsoleApplication1
Error 2 Argument '3': cannot convert from 'bool' to 'Tamir.IPLib.Packets.Util.Timeval' C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 70 56 ConsoleApplication1
Error 3 Property or indexer 'Tamir.IPLib.Packets.EthernetPacket.SourceHwAddress' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 73 13 ConsoleApplication1
Error 4 Property or indexer 'Tamir.IPLib.Packets.EthernetPacket.DestinationHwAddress' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 74 13 ConsoleApplication1
Error 5 Property or indexer 'Tamir.IPLib.Packets.EthernetPacket.EthernetProtocol' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 75 13 ConsoleApplication1
Error 6 Property or indexer 'Tamir.IPLib.Packets.IPPacket.DestinationAddress' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 78 13 ConsoleApplication1
Error 7 Property or indexer 'Tamir.IPLib.Packets.IPPacket.SourceAddress' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 79 13 ConsoleApplication1
Error 8 Property or indexer 'Tamir.IPLib.Packets.IPPacket.IPProtocol' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 80 13 ConsoleApplication1
Error 9 Property or indexer 'Tamir.IPLib.Packets.IPPacket.TimeToLive' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 81 13 ConsoleApplication1
Error 10 Property or indexer 'Tamir.IPLib.Packets.IPPacket.Id' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 82 13 ConsoleApplication1
Error 11 Property or indexer 'Tamir.IPLib.Packets.IPPacket.Version' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 83 13 ConsoleApplication1
Error 12 'Tamir.IPLib.Packets.TCPPacket' does not contain a definition for 'IPTotalLength' C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 84 17 ConsoleApplication1
Error 13 Property or indexer 'Tamir.IPLib.Packets.IPPacket.IPHeaderLength' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 85 13 ConsoleApplication1
Error 14 Property or indexer 'Tamir.IPLib.Packets.TCPPacket.SourcePort' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 88 13 ConsoleApplication1
Error 15 Property or indexer 'Tamir.IPLib.Packets.TCPPacket.DestinationPort' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 89 13 ConsoleApplication1
Error 16 Property or indexer 'Tamir.IPLib.Packets.TCPPacket.Syn' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 90 13 ConsoleApplication1
Error 17 Property or indexer 'Tamir.IPLib.Packets.TCPPacket.WindowSize' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 91 13 ConsoleApplication1
Error 18 Property or indexer 'Tamir.IPLib.Packets.TCPPacket.AcknowledgementNumber' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 92 13 ConsoleApplication1
Error 19 Property or indexer 'Tamir.IPLib.Packets.TCPPacket.SequenceNumber' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 93 13 ConsoleApplication1
Error 20 Property or indexer 'Tamir.IPLib.Packets.TCPPacket.TCPHeaderLength' cannot be assigned to -- it is read only C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 94 13 ConsoleApplication1
Error 21 'Tamir.IPLib.Packets.TCPPacket' does not contain a definition for 'ComputeIPChecksum' C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 97 17 ConsoleApplication1
Error 22 'Tamir.IPLib.Packets.TCPPacket' does not contain a definition for 'ComputeTCPChecksum' C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 98 17 ConsoleApplication1
Error 23 The type or namespace name 'GetAllDevices' does not exist in the namespace 'SharpPcap' (are you missing an assembly reference?) C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 129 48 ConsoleApplication1
Error 24 The name 'EthernetFields_Fields' does not exist in the current context C:\Documents and Settings\Free User\Desktop\ConsoleApplication1\ConsoleApplication1\Program.cs 43 27 ConsoleApplication1

.. Can any one help me to solve them?? Sniff | :^)

Thanks to all... Wink | ;)

1. What is SendTcpSynExample.cs?
2. Error message are pretty clearly telling what the problem is.
3. To me it looks like a case of incorrect reference. You might be using a different version of dll than what you should.

50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!

Hi
I am Newbie in .Net any trying to Generate Ms word Document dynamically on my button click Event i am using the Following code
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Charset = "";
HttpContext.Current.Response.ContentType = "application/msword";
string strFileName = "GenerateDocument" + ".Doc";
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;fileName=" + strFileName);
StringBuilder strHTMLContext = new StringBuilder();

strHTMLContext.Append("</table>".ToString());
strHTMLContext.Append("<br><br>".ToString()); strHTMLContext.Append(
"<p align='Center'> Note : This is a dynamically generated word document </ p > ".ToString());
HttpContext.Current.Response.Write(strHTMLContext);
string Filepath = System.IO.Path.GetFullPath(strFileName);
frameDoc.Attributes.Add("src", "Filepath");
frameDoc.DataBind();

This Code works Fine and prompts with options Save,Open,Cancel and opens a new Document in Msword
but I want to put this Document in Iframe
Can Anyone help in this Context?
Any help would be appreciated!

Hi, I get this error despite create a delegate..

private delegate void ResumeChart();
ResumeChart ChartResume;

private void ResumeChartLayout()
{
    this.m_ChartControl.ResumeChartLayout();
}

void ResetChart()
{
    this.Invoke(ChartResume);
}

Inside my constructor I have this.

public frmGraph(String stockQuote,String[] args)
{
    InitializeComponent();
    newArgs = new String[args.Length];
    Array.Copy(args, newArgs, args.Length);
    token = newArgs[0];

    this.stockQuote = stockQuote;
    //this.stockQuote = "MGM";
    label1.Text = stockQuote;
    this.Text = stockQuote + " Graph";
    ChartResume = ResumeChartLayout;
}

Inside my form load, i create a new thread to call another function

        private void frmGraph_Load(object sender, EventArgs e)
        {   
            FillDataTable();

            //SetFilter(DateTime.Now.AddDays(-9), DateTime.Now);
            m_ChartControl.Charts[0].Data = this.GenareteDataForCandle();
            m_ChartControl.SuspendChartLayout();
            m_ChartControl.LoadTheme("Manco.Chart.CF.Theme.xml");
            m_ChartControl.Charts[0].ChartType = ChartType.Line;

            m_ChartControl.Charts[0].ValueAxisList[0].Min = this.m_dStokMin;
            m_ChartControl.Charts[0].ValueAxisList[0].Max = this.m_dStokMax;


            workerThread2 = new Thread(new ThreadStart(AddAnnotations));
            workerThread2.Start();

            m_ChartControl.ResumeChartLayout();
        }

This is my AddAnnotation function that will invoke the ResetChart() method

public void AddAnnotations()
{
    string toa = "calls";
    Annotation[] anno = null;
    int countA = 0;
    int arrayIndex = 0;
    while (true)
    {

        XmlDocument xmlPlogs = getAllPlogs(toa);
        XmlNodeList plogs = xmlPlogs.SelectNodes("/PlogList/Plog");

        foreach (XmlNode plog in plogs)
        {
            XmlNodeList receivers = plog.SelectNodes("PlogUnique/Message/Receiver");

            foreach (DateTime dt in dateArray)
            {
                DateTime newDT = Convert.ToDateTime(plog.SelectSingleNode("PlogCommon/TimeOfOccurrence").InnerText);
                newDT = Convert.ToDateTime(newDT.ToString("dd MMM"));
                String content = plog.SelectSingleNode("PlogUnique/Message/Content").InnerText;
                if((content.Contains(stockQuote)) && (newDT.ToString() == dt.ToString()))
                {
                    for (int i = 0; i < dateArray.Length; i++)
                    {
                        if (dateArray[i] == newDT)
                        {
                            arrayIndex = i;
                        }
                    }
                    anno[countA] = m_ChartControl.Charts[0].AnnotationList.CreateAnnotation();
                    anno[countA].Location.TypeX = LengthType.Bound;
                    anno[countA].Location.X = arrayIndex;
                    anno[countA].Location.TypeY = LengthType.Bound;
                    anno[countA].Location.Y = 0;

                    anno[countA].Data = "     ";
                    anno[countA].Font.Size = 4;
                    anno[countA].Font.Bold = false;
                    anno[countA].Color = Color.FromArgb(1, 1, 1);

                    modulePath = this.GetType().Module.FullyQualifiedName;
                    moduleDir = Path.GetDirectoryName(modulePath);
                    anno[countA].ImageFile = Path.Combine(moduleDir, "ArrUp.png");
                    countA++;
                }

            }
        }
        Thread.Sleep(5 * 60 * 1000);
        ResetChart();
    }
}

Try after changing the ResetChart function like this.

void ResetChart()        <br />
{<br />
      this.m_ChartControl.Invoke(ChartResume);<br />
}

hmm.. i still get the same error Frown | :(

could this be the error? under the AddAnnotations method.

anno[countA] = m_ChartControl.Charts[0].AnnotationList.CreateAnnotation();

Yes. Previously I did not went through the AddAnnotation() function.

Since you ChartControl is in the UI Thread, you can only access/modify the ChartControl properties by using a delegate.

Just like you used a delegate to call the ChartResume method, use another Delegate to add annotation. This will surely solve the problem.

i have create another Delegate

private delegate void AddAnnotation();
AddAnnotation addNewAnnotation;

private void CreateAnnotation()
{
    m_ChartControl.Charts[0].AnnotationList.CreateAnnotation();
}
void cAnnotation()
{
    this.Invoke(addNewAnnotation);
}

and under the AddAnnoations method

i change it to

anno[countA] = cAnnotation();

and i get this error

Error 4 Cannot implicitly convert type 'void' to 'Manco.Chart.CF.Layout.Annotation'

i tried change all the void to Annotation but still get error

modified on Friday, December 11, 2009 12:00 PM

The type ‘T’ must be a non null able value type in order to use it as parameter ‘T’ in the generic type or method system.nullable<T>

How can i solve this Problem?

public class SimpleProperty<T>
{
T _value;

public SimpleProperty(T value)
{
_value = value;
}

public T Value
{
get { return _value; }
set { _value = value; }
}
public string SetValue
{
set
{
_value = ToNumber<T>(value);
}
}
private TP ToNumber<TP>(string input) where TP : struct
{
Type[] paramTypes = new Type[] { typeof(string), typeof(TP).MakeByRefType() };
MethodInfo method = typeof(TP).GetMethod("TryParse", paramTypes);
Object[] parameters = new Object[] { input, null };
if (method != null)
{
if ((bool)method.Invoke(typeof(TP), parameters))
return (TP)parameters[1];
}
return default(TP);
}

}

I am not clear on your question, but if I understood your need:

Try this:

public sealed class SimpleProperty<t> : IDisposable where T : class, new() // Specify that T must be a class.

Hi,

Having a class with parent child relationships is quite common (I think), and I normally traverse such trees using recursion.

Class looks like this:

public class Product {
    public List<Product> Parents {get; set;}
    public List<Product> Children {get; set;}
    public string Name {get; set;}
    public override string ToString() { return Name; }
}

Recursion will look like this:

public void Dump(Product p) {
    Console.WriteLine(p.ToString());

    foreach (var child in p.Children)
        Dump(child);  // (1)
}

However, I was told by someone before that using threads will be faster and less expensive.
Can anyone send me a sample code of how to do this? I'm thinking that I should simply change (1) to a ParameterizedThreadStart... but maybe there's a better practice?

Thanks in advance.

Rafferty

In fact, the person that told you this does not know the final step of your application or he tried to impress you Smile | :)

You may have multiple threads in order to travers the tree, but in your case, the problem will be the output (Console.Writeline(....)) which is thread safe, you will have a lock in order to block multiple threads to access the output buffer.

So, except if you are sure that you have a multiple core, in order millions of data (but in this case do not use the Console), I advise you to stay thread safe (1 thread and this one will catch the maximum of CPU) or otherwise you wil have a timce slice handling to do and lock/unlock to manage.

You should have a good start with:

Generic Background Worker[^]

Good luck

can anyone check this code and tell us what is worring with it ?thanks

using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using System.IO;

namespace ConsoleApplication2
{
      class Program
      {
            static List<Contact> myContact=new List<Contact>();

            struct Contact
            {
                  public int ContactID;
                  public string FirstName;
                  public string Surname;
                  public string Email;
            }

            static void createMenu()
            {
                  Console.Clear();
                  Console.WriteLine("===============================");
                  Console.WriteLine("* *");
                  Console.WriteLine("* Contact Management Solution *");
                  Console.WriteLine("* *");
                  Console.WriteLine("* 1. New Contact                     *");
                  Console.WriteLine("* 2. Edit Contact                  *");
                  Console.WriteLine("* 3. Remove Contact               *");
                  Console.WriteLine("* 4. View All Contacts            *");
                  Console.WriteLine("* X. Exit                              *");
                  Console.WriteLine("* *");
                  Console.WriteLine("===============================");

            }

            static void Main(string[] args)
            {
                  string strUserSelect;
                  do
                  {
                        createMenu();
                        strUserSelect = Console.ReadLine();
                        if (strUserSelect == "1")
                        {
                              NewContact();
                        }
                        else if (strUserSelect == "2")
                        {
                              EditContact();
                        }
                        else if (strUserSelect == "3")
                        {
                              RemoveContact();
                        }
                        else if (strUserSelect == "4")
                        {
                              ViewAllContacts();
                        }
                  } while (strUserSelect.ToUpper() != "X");

                  SaveToFile();
            }

            static void LoadContacts()
            {
                  string strLineIn;
                  string[] strArrayIn;

                  Contact ContactIn;

                  StreamReader Sr = new StreamReader("c:\\Contacts.txt");

                  while (!Sr.EndOfStream)
                  {
                        strLineIn = Sr.ReadLine();
                        strArrayIn = strLineIn.Split(',');
                        ContactIn.ContactID = int.Parse(strArrayIn[0]);
                        ContactIn.FirstName = strArrayIn[1];
                        ContactIn.Surname = strArrayIn[2];
                        ContactIn.Email = strArrayIn[3];

                        myContact.Add(ContactIn);
                  }

                  Sr.Close();

            }

            static void NewContact()
            {
                  try
                  {
                        Contact ContactIn;

                        Console.Write("Contact ID : ");
                        ContactIn.ContactID = int.Parse(Console.ReadLine());

                        Console.Write("First Name : ");
                        ContactIn.FirstName = Console.ReadLine();

                        Console.Write("Sure Name   : ");
                        ContactIn.Surname = Console.ReadLine();

                        Console.Write("      Email   : ");
                        ContactIn.Email = Console.ReadLine();

                        myContact.Add(ContactIn);

                        Console.WriteLine("Contact has been saved successfully...");
                        Console.ReadLine();
                  }
                  catch (Exception ex)
                  {
                        Console.WriteLine(ex.Message);
                        Console.ReadLine();
                  }
            }

            static void EditContact()
            {
                  try
                  {
                  Contact ContactIn;

                  Console.Write ("Contact ID :");
                  int ContactID=int.Parse(Console.ReadLine());

                  ContactIn =myContact.Find(delegate(Contact Con) { return Con.ContactID.Equals(ContactID); });

                  if (ContactID != 0)
                  {
                        myContact.Remove(ContactIn);
                        Console.Write("First Name : ");
                        ContactIn.FirstName = Console.ReadLine();

                        Console.Write("Sure Name   : ");
                        ContactIn.Surname = Console.ReadLine();

                        Console.Write("      Email   : ");
                        ContactIn.Email = Console.ReadLine();

                        myContact.Add(ContactIn);

                        Console.WriteLine("Contact has been updated...");
                  }
                  else
                  {
                        Console.WriteLine("Contact not found...");
                  }
                  Console.ReadLine();
            }
            catch (Exception ex)
            {
                  Console.WriteLine(ex.Message);
                  Console.ReadLine();
            }
            }

            static void RemoveContact()
            {
                  try
                  {
                  Console.Write("Contact ID :");
                  int ContactID = int.Parse(Console.ReadLine());

                  myContact.RemoveAll(delegate(Contact Con) { return Con.ContactID.Equals(ContactID); });
                  Console.WriteLine("Contact has been updated...");
                  Console.ReadLine();
                  }
                  catch (Exception ex)
                  {
                  Console.WriteLine(ex.Message);
                  Console.ReadLine();
                  }
            }

            static void ViewAllContacts()
            {

                  for(int i=0;i<myContact.Count;i++)
                        Console.WriteLine("{0},{1},{2},{3}", myContact[i].ContactID, myContact[i].FirstName, myContact[i].Surname, myContact[i].Email);

                  Console.ReadLine();
            }

            static void SaveToFile()
            {

                  File.Delete("C:\\Contacts.txt");
                  StreamWriter Sw=new StreamWriter("C:\\Contacts.txt");
                  myContact.ForEach(delegate(Contact Con)
                  { Sw.WriteLine("{0},{1},{2},{3}", Con.ContactID, Con.FirstName, Con.Surname, Con.Email); });

                  Sw.Flush();
                  Sw.Close();
            }

      }
}

                     Console.WriteLine(" Email :");
                     ContactIn.Email = Console.ReadLine());

                        myContact.Add(ContactIn);

                        Console.WriteLine("Contact has saved successfully...");
                        Console.ReadLine();

                  catch (Exception ex)
                  {
                        Console.WriteLine(ex.Message);
                        Console.ReadLine();
                  }

            }
}

            static void EditContact()
            {
                  try
                  {
                  Contact ContactIn;

                  Console.Write ("Contact ID :");
                  int ContactID=int.Parse(Console.ReadLine());

                  ContactIn =myContact.Find(delegate(Contact Con) { return Con.ContactID.Equals(ContactID); });

                  if (ContactID != 0)
                  {
                        myContact.Remove(ContactIn);
                        Console.Write("First Name : ");
                        ContactIn.FirstName = Console.ReadLine();

                        Console.Write("Sure Name   : ");
                        ContactIn.Surname = Console.ReadLine();

                        Console.Write("      Email   : ");
                        ContactIn.Email = Console.ReadLine();

                        myContact.Add(ContactIn);

                        Console.WriteLine("Contact has been updated...");
                  }
                  else
                  {
                        Console.WriteLine("Contact not found...");
                  }
                  Console.ReadLine();
            }
            catch (Exception ex)
            {
                  Console.WriteLine(ex.Message);
                  Console.ReadLine();
            }
            }

            static void RemoveContact()
            {
                  try
                  {
                  Console.Write("Contact ID :");
                  int ContactID = int.Parse(Console.ReadLine());

                  myContact.RemoveAll(delegate(Contact Con) { return Con.ContactID.Equals(ContactID); });
                  Console.WriteLine("Contact has been updated...");
                  Console.ReadLine();
                  }
                  catch (Exception ex)
                  {
                  Console.WriteLine(ex.Message);
                  Console.ReadLine();
                  }
            }

            static void ViewAllContacts()
            {

                  for(int i=0;i<myContact.Count;i++)
                        Console.WriteLine("{0},{1},{2},{3}", myContact[i].ContactID, myContact[i].FirstName, myContact[i].Surname, myContact[i].Email);

                  Console.ReadLine();
            }

            static void SaveToFile()
            {

                  File.Delete("C:\\Contacts.txt");
                  StreamWriter Sw=new StreamWriter("C:\\Contacts.txt");
                  myContact.ForEach(delegate(Contact Con)
                  { Sw.WriteLine("{0},{1},{2},{3}", Con.ContactID, Con.FirstName, Con.Surname, Con.Email); });

                  Sw.Flush();
                  Sw.Close();
            }

      }
}

Instead of just pasting your entire program and asking for someone to debug it for you, narrow down the code to the lines that are relavent to the problem, describe the error, and then maybe someone can help you.

will do that . thanks. im new to this . thanks again

im very new to this and i have managed to write this code but it doesn't work!!. anyone can help?

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

namespace ConsoleApplication2
{
class Program
{
static List<Contact> myContact=new List<Contact>();

struct Contact
{
public int ContactID;
public string FirstName;
public string Surname;
public string Email;
}

static void createMenu()
{
Console.Clear();
Console.WriteLine("===============================");
Console.WriteLine("* *");
Console.WriteLine("* Contact Management Solution *");
Console.WriteLine("* *");
Console.WriteLine("* 1. New Contact *");
Console.WriteLine("* 2. Edit Contact *");
Console.WriteLine("* 3. Remove Contact *");
Console.WriteLine("* 4. View All Contacts *");
Console.WriteLine("* X. Exit *");
Console.WriteLine("* *");
Console.WriteLine("===============================");

}

static void Main(string[] args)
{
string strUserSelect;
do
{
createMenu();
strUserSelect = Console.ReadLine();
if (strUserSelect == "1")
{
NewContact();
}
else if (strUserSelect == "2")
{
EditContact();
}
else if (strUserSelect == "3")
{
RemoveContact();
}
else if (strUserSelect == "4")
{
ViewAllContacts();
}
} while (strUserSelect.ToUpper() != "X");

SaveToFile();
}

static void LoadContacts()
{
string strLineIn;
string[] strArrayIn;

Contact ContactIn;

StreamReader Sr = new StreamReader("c:\\Contacts.txt");

while (!Sr.EndOfStream)
{
strLineIn = Sr.ReadLine();
strArrayIn = strLineIn.Split(',');
ContactIn.ContactID = int.Parse(strArrayIn[0]);
ContactIn.FirstName = strArrayIn[1];
ContactIn.Surname = strArrayIn[2];
ContactIn.Email = strArrayIn[3];

myContact.Add(ContactIn);
}

Sr.Close();

}

static void NewContact()
{
try
{
Contact ContactIn;

Console.Write("Contact ID : ");
ContactIn.ContactID = int.Parse(Console.ReadLine());

Console.Write("First Name : ");
ContactIn.FirstName = Console.ReadLine();

Console.Write("Sure Name : ");
ContactIn.Surname = Console.ReadLine();

Console.Write(" Email : ");
ContactIn.Email = Console.ReadLine();

myContact.Add(ContactIn);

Console.WriteLine("Contact has saved successfully...");
Console.ReadLine();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
Console.ReadLine();
}
}

static void EditContact()
{
try
{
Contact ContactIn;

Console.Write ("Contact ID :");
int ContactID=int.Parse(Console.ReadLine());

ContactIn =myContact.Find(delegate(Contact Con) { return Con.ContactID.Equals(ContactID); });

if (ContactID != 0)
{
myContact.Remove(ContactIn);
Console.Write("First Name : ");
ContactIn.FirstName = Console.ReadLine();

Console.Write("Sure Name : ");
ContactIn.Surname = Console.ReadLine();

Console.Write(" Email : ");
ContactIn.Email = Console.ReadLine();

myContact.Add(ContactIn);

Console.WriteLine("Contact has been updated...");
}
else
{
Console.WriteLine("Contact not found...");
}
Console.ReadLine();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
Console.ReadLine();
}
}

static void RemoveContact()
{
try
{
Console.Write("Contact ID :");
int ContactID = int.Parse(Console.ReadLine());

myContact.RemoveAll(delegate(Contact Con) { return Con.ContactID.Equals(ContactID); });
Console.WriteLine("Contact has been updated...");
Console.ReadLine();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
Console.ReadLine();
}
}

static void ViewAllContacts()
{

for(int i=0;i<myContact.Count;i++)
Console.WriteLine("{0},{1},{2},{3}", myContact[i].ContactID, myContact[i].FirstName, myContact[i].Surname, myContact[i].Email);

Console.ReadLine();
}

static void SaveToFile()
{

File.Delete("C:\\Contacts.txt");
StreamWriter Sw=new StreamWriter("C:\\Contacts.txt");
myContact.ForEach(delegate(Contact Con)
{ Sw.WriteLine("{0},{1},{2},{3}", Con.ContactID, Con.FirstName, Con.Surname, Con.Email); });

Sw.Flush();
Sw.Close();
}

}
}

please read the "how to ask a question" text on this page, then edit your message accordingly.
describe the problem, and show relevant code using PRE tags. Only then will you get help.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Luc Pattyn wrote:
please read the "how to ask a question" text on this page

Just that text! Not the the entire post, right.

50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!

im sorry im totaly new to this . will try to resend it again.

bassam eshteba wrote:
im totaly new to this

and that is why there is a "How to get an answer to your question" message a few lines up from here. Read it. Follow it.

bassam eshteba wrote:
will try to resend it again.

that does not help unless you learn how to post questions first.

OMG | :OMG:

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Hi All

I'm trying to use HTML Agility Pack to get the description text from inside the:

<meta name="description" content="**this is the text i want to extract and store in a string**" />

And someone a little while ago suggested I use HTMLAgilityPack. But I don't know how to use it, and the documentation for it that I've found (including the docs contained in the downloads) all have invalid links and therefor cannot view the documentation.

Can somebody please help me solve this?

Regards,
Jason