C# Discussion Boards - CodeProject

Re: how to avoid postbacks

29-Nov-07 14:22

The best way to avoid postbacks is to not develop Web applications.

Anthony Mushrow29-Nov-07 14:50

Anthony Mushrow

29-Nov-07 14:50

Well, it is guaranteed to work Roll eyes | :rolleyes:

My current favourite word is: PIE!

I have changed my name to my regular internet alias. But don't let the 'Genius' part fool you, you don't know what 'SK' stands for.
-The Undefeated

Re: how to avoid postbacks

ShaikhAffi29-Nov-07 23:03

ShaikhAffi

29-Nov-07 23:03

very funny well i did post the coding i just not want to execute the code on every post back
any help will be highly appreciated

what functions could I use to get this effect in C#????

para para29-Nov-07 11:00

para para

29-Nov-07 11:00

Hello I have coding experience in C++ in Visual Studio but not in C# besides basic hello world and I want to create something like this

http://img521.imageshack.us/my.php?image=gogulexl4.jpg

basically it is a embeded browser window inside another window the main window I should be able to use goole normally or any other site and automatically extract some search queries when I click on a button or something(to be thought of later on).

Thank you in advance

hello

Re: what functions could I use to get this effect in C#????

Jim Conigliaro29-Nov-07 11:03

Jim Conigliaro

29-Nov-07 11:03

If I understand what you are looking for, you should be able to create a basic windows form application and then use the web browser control to embed Internet Explorer into the application.

Jim Conigliaro
jconigliaro@ieee.org
http://www.jimconigliaro.com

Re: what functions could I use to get this effect in C#????

pmarfleet29-Nov-07 11:07

pmarfleet

29-Nov-07 11:07

WebBrowser Control[^] is what you want.

Paul Marfleet

"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush

Commenting the implementation of an interface [modified]

Todd Smith29-Nov-07 10:31

Todd Smith

29-Nov-07 10:31

How do you go about documenting the implementation of an interface? Do you just copy the interface comment to your implementation? Skip documenting the implementation? Create a new unique comment for the implementation?

public interface IMyInterface
{
		/// <summary>
		/// Get something from somewhere.
		/// </summary>
		/// <param name="param1">A param.</param>
		/// <returns>Returns a positive value represeting some value from an unknown place otherwise returns 0.</returns>
		int GetSomething (int param1);
}

public class MyClass : IMyInterface
{
		/// duplicate the interface comment?
 		public int GetSomething (int param1);
		{
			// TODO: implement of GetSomething
		}
}

I'm currently leaning towards reusing the interface comment and figured out how to have it auto-magically included in the implementation with the following code. NOTE: you'll need to make a post-build copy of your XML files and reference those otherwise you'll get a file in use error.

public class MyClass : IMyInterface
{
		/// <include file="Doc\MyAssembly.XML" path="//member[contains(@name,'IMyInterface.GetSomething')]/*" />
		int GetSomething (int param1);
		{
			// TODO: implement of GetSomething
		}
}

p.s. is there an easy way to paste code with special characters (< > &) so it automatically converts them to their encoded form?

-- modified at 16:36 Thursday 29th November, 2007

Todd Smith

Re: Commenting the implementation of an interface

PIEBALDconsult29-Nov-07 10:50

HELP PLEASE - databindings, comboboxes and headaches..

29-Nov-07 10:50

That may depend on what the thing does, but probably start by copying the comment and maybe add detail.

public interface IDataSource
{		
/// <summary>		
/// Get something from somewhere.		
/// </summary>		
/// <param name="param1">A param.</param>		
/// <returns>Returns a positive value representing some value from an unknown place otherwise returns 0.</returns>		
    int GetSomething (int param1);
}
 
class DataBase : IDataSource
{
/// <summary>		
/// Get something from the database.		
/// </summary>		
/// <param name="param1">A param.</param>		
/// <returns>Returns a positive value representing some value from the database otherwise returns 0.</returns>    
    int GetSomething (int param1) ...
}
 
class WebService : IDataSource
{
/// <summary>		
/// Get something from the WebService.		
/// </summary>		
/// <param name="param1">A param.</param>		
/// <returns>Returns a positive value representing some value from the WebService otherwise returns 0.</returns>    
    int GetSomething (int param1) ...
}

XenReborn29-Nov-07 10:02

XenReborn

29-Nov-07 10:02

Ok this should be simple.
I made a form, added a combobox (for selecting items to edit, not for updating fields), several textboxes, a few checkboxes etc. On formshow it connects to my database, draws down the existing data, no problem. All the records in the datatable that were the result of a query, I could select from, and the other databound components would display the records contents, no problem..... however.... when i add a new row, the combobox updates, but if i select the NEW item in it, all the databound objects are still pointing to the record to which I had selected prior, and if i make changes to their contents, it updates the fields associated with the priorily selected record, I can still select the original records and edit their contents just fine... but the NEW record's contents never display, and the record to which the databound objects are pointing, never change either... can someone please help before all my hair turns white ? LOL

the setup code that establishes databindings and populates the data table is as follows.

mySqlDataAdapter1.SelectCommand =
new MySql.Data.MySqlClient.MySqlCommand(
"SELECT *,CONCAT(ENTRY_NO,\":\", TYPENAME) AS DISPLAYVAL FROM FILEINFO.FILETYPE ORDER BY TYPENAME",
mySqlConnection1);

mySqlDataAdapter1.Fill(dataSet1);

ComboList = new DataTable();

ComboList = dataSet1.Tables[0];

comboBox1.DataSource = ComboList;
comboBox1.DisplayMember = "DISPLAYVAL";
comboBox1.ValueMember = "ENTRY_NO";

FILENAME.DataBindings.Clear();
FILENAME.DataBindings.Add("TEXT", ComboList, "TYPENAME");

DESCRIPTION.DataBindings.Clear();
DESCRIPTION.DataBindings.Add("TEXT", ComboList, "DESCRIPTION");

FILEEXT.DataBindings.Clear();
FILEEXT.DataBindings.Add("TEXT", ComboList, "EXTENSION");

RECLENGTH.DataBindings.Clear();
RECLENGTH.DataBindings.Add("TEXT", ComboList, "RECORDLENGTH");
RECLENGTH.CausesValidation = true;

ISRECDELIM.DataBindings.Clear();
ISRECDELIM.DataBindings.Add("CHECKED", ComboList, "IS_RECORD_DELIM");

ISFIELDDELIM.DataBindings.Clear();
ISFIELDDELIM.DataBindings.Add("CHECKED", ComboList, "IS_FIELD_DELIM");

ISFLATFILE.DataBindings.Clear();
ISFLATFILE.DataBindings.Add("CHECKED", ComboList, "IS_FLAT");

RECDELIM.DataBindings.Clear();
RECDELIM.DataBindings.Add("TEXT", ComboList, "RECORD_DELIM");

FIELDDELIM.DataBindings.Clear();
FIELDDELIM.DataBindings.Add("TEXT", ComboList, "FIELD_DELIM");

I have a button which is labeled new record, its click event handlers is as follows:

private void button3_Click(object sender, EventArgs e)
{

DataRow r = ComboList.NewRow();

r["ENTRY_NO"] = DBNull.Value;
r["TYPENAME"] = "NEW FILE TYPE";
r["DISPLAYVAL"] = "X: " + r["TYPENAME"].ToString();
ComboList.Rows.Add(r);
}

Code mapped to the datatables.oncolumnchanged event is as follows....
private void UpdateDisplayVal ( Object sender,
DataColumnChangeEventArgs e)
{
if (e.Column.ColumnName == "TYPENAME")
{
e.Row["DISPLAYVAL"] = e.Row["ENTRY_NO"].ToString() + ": " + e.Row["TYPENAME"].ToString();
}
}

The combobox updates with a value "X: NEW FILE TYPE", when i select a new item in it
none of the other bound objects update with the new value, as they do when i selected
the old item.

Re: How do i....

C# Beginner Nick29-Nov-07 9:43

C# Beginner Nick

29-Nov-07 9:43

Meaning, it won't turn on. Says missing files, when ever file is there.

Re: How do i....

Luc Pattyn29-Nov-07 11:31

Luc Pattyn

29-Nov-07 11:31

Hi,

you should make an effort to be specific.
The exact error message (or number), any extra information (maybe a stack traceback),
other symptoms, all these may help us help you.

Also an exact error message can be typed into Google and point to a solution.

If you're the author of a program that fails without being very specific at it, you should
improve your program by adding:
- checks for success after each system call
- displaying what goes wrong with all available detail
(e.g. GetLastError function)

Without additional information, no one will be able to help you except maybe by wild guessing.

PS: see my second tip below.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

this months tips:
- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
- use PRE tags to preserve formatting when showing multi-line code snippets

Overloading Keypress

MarkB77729-Nov-07 9:18

MarkB777

29-Nov-07 9:18

I ran into a different way of exiting an application (via the escape key) the other day...

 <br />
protected override void KeyPress(object sender, KeyPressEventArgs e)<br />
{<br />
     if ((int)(byte)e.KeyCode == (int)System.Windows.Forms.Keys.Escape)<br />
     { <br />
          Application.Exit();<br />
     }<br />
}<br />

What i'm wondering is what does the (byte) do?

The code works with or without it...

I took this code from a DirectX tutorial within the SDK, so I assume whoever wrote it knows what their doing.

Cheers,

Mark.

Re: Overloading Keypress

Luc Pattyn29-Nov-07 9:41

Luc Pattyn

29-Nov-07 9:41

Hi Mark,

I'm using .NET 2.0 and KeyPressEventArgs does not have a KeyCode, but the KeyDown and
KeyUp events would offer it.

AFAIK KeyCode returns a Keys value, so you can compare directly, without casting.
The (byte) casting looks like an attempt to mask modifier keys such as SHIFT, ALT, CTRL
but I don't like the way it is done, and I am not sure it is relevant here either.

So I would try a simple if (e.KeyCode==Keys.Escape)...

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

collection or array

kenwen29-Nov-07 8:59

kenwen

29-Nov-07 8:59

Hi
I'm very new to C# and although I have managed to work through creating a simple method for arrays which holds the results of a query with just one return field
I now want to store the results of a query with many records of 15 or more fields and I don't know whether this should be in some kind of array or in a collection, in either case I don't know where to begin. Can anyone help in as simple terms as possible please?

regards
kenwen

led mike29-Nov-07 9:05

led mike

29-Nov-07 9:05

kenwen wrote:
Can anyone help in as simple terms as possible please?

That might be difficult, wait.... here try this[^]

kenwen29-Nov-07 9:16

kenwen

29-Nov-07 9:16

That looks to be the kind of thing I want thanks

PIEBALDconsult29-Nov-07 9:57

29-Nov-07 9:57

Ummm... wouldn't that be a System.Data.Datatable?

John_Adams30-Nov-07 1:02

John_Adams

30-Nov-07 1:02

Hi,

You may try using ArrayList, the capacity of an ArrayList is the number of elements the list can hold. As elements are added to an ArrayList, the capacity is automatically increased as required through reallocation. The capacity can be decreased by calling TrimToSize or by setting the Capacity property explicitly. Indexes in this collection are zero-based.

For more information on this you may use visit the following link:
http://msdn2.microsoft.com/en-us/library/system.collections.arraylist(VS.71).aspx[^]

I hope this helps.

Regards,
John Adams
ComponentOne LLC

or || operator on strings?

kenwen4-Dec-07 1:16

kenwen

4-Dec-07 1:16

Hi John,

Sorry for the delay in replying been offline over the weekend.

Just tried the arraylist and it seems to do what I need.

thanks
for your help

regards
Ken Stevens

h0st1le29-Nov-07 8:19

h0st1le

29-Nov-07 8:19

hi there still new to c# so forgive this simple question
but is there an operator i can use to perform OR/AND operations on strings
ie

if (currentFd.Name.ToUpper() != "SHAPE" || "FID" || "OID")
{
// do whatever
}

id prefer not to turn this into a case statement and embedded if statements seem pretty ridiculous as well, but i searched around and had no luck finding a solution. anybody out there help?? thanks in advance for helping a newbie

Alaric_29-Nov-07 8:21

Alaric_

29-Nov-07 8:21

use the .Equals() method

if(currentFd.Name.ToUpper().Equals("SHAPE") || currentFd.Name.ToUpper().Equals("FID") || currentFd.Name.ToUpper().Equals("OID"))
{
//do whatever
}

...only use cascading if statements if you are really pissed off at your grader Wink | ;)

-- modified at 14:39 Thursday 29th November, 2007

"I need build Skynet. Plz send code"

PIEBALDconsult29-Nov-07 8:31

29-Nov-07 8:31

Alaric_ wrote:
== and != can't be applied to strings in that way

What? It's not a problem with the == operator.

Alaric_29-Nov-07 8:45

Alaric_

29-Nov-07 8:45

...let me rephrase....(in my opinion) == shouldn't be applied to strings in that way because strings are not actually value types....if you were checking it against null, then "str==null" would be acceptable because you would be comparing whether the value of the reference was equal to null or not. I did not intend to say that "==" and "!=" were causing his problems

...if you want to test whether str is equal to "some string value",

str = "some literal string value";

if(str == "some literal string value"){}    // is improper
if(str.Equals("some literal string value")){} //is proper

the value of the reference to str IS NOT EQUAL to "some literal string value"
but the value stored by str IS EQUAL to "some literal string value"

"I need build Skynet. Plz send code"