Re: How to make a Textbox only take numbers? - C# Discussion Boards

Genbox14-Jun-07 7:22

14-Jun-07 7:22

I have a network application that runs in a thread for it self, my main application subscribes to the events the network application fires (such as SignedIn, ExceptionOccured and so on).

My problem is that when a event in the other thread if fired, I want to disable/enable and change a lot of stuff in my main application GUI.
But for every change I want to make in my main application, I have to write a delegate and invoke it.

This gives me A LOT of code that is only used once, and it just seems stupid.
Is there a way of executing a method with invoke without declaring a delegate?

I have an example to demonstrate my problem:

public class MyClass<br />
{<br />
<br />
public MyClass()<br />
{<br />
// starting the network application thread here<br />
...<br />
// subscribing to the events<br />
 myThread.SignOut += SignOut;<br />
}<br />
<br />
public void SignOut()<br />
{<br />
// This i would have to create a delegate for, since the myForm object is in<br />
// another thread. This forces me to create a delegate for<br />
// every (different) method call in my application.<br />
myForm.ShowLogin();<br />
}<br />
}

Re: Get rid of delegate declarations

Ed.Poore14-Jun-07 9:07

Ed.Poore

14-Jun-07 9:07

Not sure if this is what you're trying to accomplish but:
If using .NET 2 you can use an anoymous delegate which would perform the same function (internally the code is very similar) but the source code would look more readable.

pubilc MyClass()
{
    myThread.SignOut += new YourDelegateTypeHere(delegate() { myForm.ShowLogin(); });
}

Re: Get rid of delegate declarations

Genbox14-Jun-07 10:10

Genbox

14-Jun-07 10:10

Thats better than what I'm doing now. Thanks!

If anyone else has some tips, you are welcome to post them.

Re: Get rid of delegate declarations

Jimmanuel15-Jun-07 5:53

Jimmanuel

15-Jun-07 5:53

When I'm doing a lot of cross thread operations I try to make my functions similar so that I can reuse their delegates as much as possible. If I have 10 functions that all have to be Invoked, only one delegate is needed if they all have the same return value and parameter list . . .

Re: Get rid of delegate declarations

Genbox15-Jun-07 9:15

Genbox

15-Jun-07 9:15

Yeah, that's what I was doing, but I don't like to do this because of the delegate naming and overhead of creating a delegate.

I found the perfect solution:

// In a form:<br />
if (InvokeRequired)<br />
   {<br />
      MethodInvoker invoker = delegate<br />
      {<br />
         lblStatus.Text = message;<br />
      };<br />
      Invoke(invoker);<br />
   }<br />
   else<br />
      lblStatus.Text = message;

With this I can execute cross-thread calls without creating a named delegate and a method for the delegate to call. Best of all; the code is readable.

How to make a Textbox only take numbers?

dipuks14-Jun-07 6:43

dipuks

14-Jun-07 6:43

I made a C# application and i want the Textbox control to just take numbers and no characters. In VC++ this can be easily done by setting a property.

Any idea how to do this in C#?

Thanks

Re: How to make a Textbox only take numbers?

Sathesh Sakthivel14-Jun-07 6:52

Sathesh Sakthivel

14-Jun-07 6:52

Go for Validation control such that it should accept only Numbers.

Regards,

Satips. Rose | [Rose]

Re: How to make a Textbox only take numbers?

Dave Kreskowiak14-Jun-07 7:06

Dave Kreskowiak

14-Jun-07 7:06

You asked this question 3 days ago and got your answer. Asking it again will only get you ignored.

There are a ton of examples on how to do this on the web. You can create your own TextBox class by inheriting from TextBox, handling the KeyDown event and checking to see if the key pressed is numeric or not. You'll also have to make exceptions for the Delete and Backspace keys, plus the minus sign and decimal if you want your box to accept negative numbers and/or floating point numbers, without regard to culture I might add. You'll have to code your key filter to check what the culture specific number formatting characters are if you want it to support input from any culture other than English.

If you want it written for you, Google for "c# numeric textbox[^]".

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Re: How to make a Textbox only take numbers?

Hesham Yassin20-Jun-07 0:29

Hesham Yassin

20-Jun-07 0:29

use a maskedTextBox instead of textBox

DataGridView - Randomly re-arranging columns

Tristan Rhodes14-Jun-07 5:43

Tristan Rhodes

14-Jun-07 5:43

Hi Guys,

I've got a WinForms DataGridView grid view setup in the following manner:

* 3 columns
* Columns 1 and 2 are readonly strings
* Column 3 is an editable int
* Column 3 is the shortest column
* The column sizes are fixed
* The DataGridView size is snapped to the total width of the columns

For some reason, regardless of what i do, column 3 always ends up in the middle, and column 2 at the end. I have even tried swapping them in the designer, but that displays as expected.

It's driving me nuts.

Has anyone encountered this problem before?

Cheers

Tris

-------------------------------

Carrier Bags - 21st Century Tumbleweed.

Re: DataGridView - Randomly re-arranging columns

Pualee14-Jun-07 6:21

Pualee

14-Jun-07 6:21

Tristan Rhodes wrote:
Has anyone encountered this problem before?

Yes.

I don't think I solved it correctly, but what I did was:

Create the columns at run time and insert them in the order I wanted them to appear. Then when I bound the DataTable, everything appeared correctly. Make sure you don't have any columns without a position assigned (ie hidden column at column 1) interfering with your desired order.

Pualee

Listing Active Directory Users ? [modified]

ASysSolvers14-Jun-07 4:51

ASysSolvers

14-Jun-07 4:51

hi,
i want to list active directory users and same time get the login name of them...code are here..but gives an error here,

oResult.GetDirectoryEntry().Properties["cn"].Value

saying it is null...

code and path is correct because i can show oResults.Count saying it having

items..
My question is how to get userid and names...how to add properties to load DirectorySercher to get i
think it is not functioning...
here that i have coded.. im listing my code

im calling to method passing path like..
GetAllUsers("LDAP://test.lk/OU=sms,dc=test,dc=lk")
here is my code,...

public Hashtable GetAllUsers(string ldapServerName)<br />
{           <br />
   string _ldapServerName = ldapServerName;            <br />
   DirectoryEntry oRoot = new DirectoryEntry(ldapServerName);<br />
   DirectorySearcher oSearcher = new DirectorySearcher(oRoot);<br />
   SearchResultCollection oResults ;            <br />
   Hashtable RetArray =new Hashtable();<br />
   try<br />
   {<br />
      oSearcher.PropertiesToLoad.Add("uid");<br />
      oSearcher.PropertiesToLoad.Add("givenname");<br />
      oSearcher.PropertiesToLoad.Add("cn");<br />
      oResults = oSearcher.FindAll();<br />
      foreach (SearchResult oResult in oResults)<br />
      {<br />
        if (oResult.GetDirectoryEntry().Properties["cn"].Value.ToString()! "")<br />
       {<br />
          RetArray.Add(oResult.GetDirectoryEntry().Properties["uid"].Value,<br />
            oResult.GetDirectoryEntry().Properties["cn"].Value);<br />
       }<br />
      }<br />
   }<br />
catch(Exception e)<br />
{<br />
   MessageBox.Show("Error is " + e.Message);<br />
   return RetArray;<br />
}<br />
return RetArray;<br />
}

i oblidged u very much if u can provide me help on regarding..any resource

articles,sample code...
thanks in advance!

N:B
---------------------------------------------------------------------------

rootSearcher.PropertiesToLoad.Add(“name”); // Full name…
rootSearcher.PropertiesToLoad.Add(“mail”); // Primary email addy…
rootSearcher.PropertiesToLoad.Add(“telephoneNumber”); // Phone #...

like that i want to get the userID ?
plz.......tell me the correct statement for that ?

-- modified at 12:00 Thursday 14th June, 2007

Re: Listing Active Directory Users ?

Manas Bhardwaj14-Jun-07 5:44

Manas Bhardwaj

14-Jun-07 5:44

Code looks OK. But what I guess you are getting some null value when you are adding it to hashtable.
You can try by putting a try catch block in foreach block
Rose | [Rose]

Data Source Configuration Wizard in VS2005 not accepting views with parameters

Christopher Stratmann14-Jun-07 4:26

Christopher Stratmann

14-Jun-07 4:26

I have a Microsoft Access 2003 database with a .mdb extension with a table and a query on that table. In my query I have a parameter that allows me to get prompted within MS Access just before running the query.

The problem is when adding that .mdb file to my projects solution within VS I get prompted with the "Data Source Configuration Wizard" that shows the tables and views I can import. The view doesn't come up. Now if I take that parameter off and then try to import the .mdb file into my projects solution the view is there ready to be imported.

Do anyone know a workaround to import a query with a parameter?

Chris

Parsing each file in directory

Rick van Woudenberg14-Jun-07 3:51

Rick van Woudenberg

14-Jun-07 3:51

Dear all,

I've got a directory full of files of the same type. Basically what they are CSV or TXT files. I would like to parse each individual file to a DLL for processing. I can select each individual file manually and process it :

<br />
private void btnGo_Click(object sender, EventArgs e)<br />
        {<br />
            string abd = "D:\\data\\File\\File1.csv";<br />
            try<br />
                {<br />
                    StreamReader rdr = new StreamReader(abd);<br />
                    while (rdr.Peek() >= 0)<br />
                    {<br />
                        dataGridView2.DataSource = CsvParser.Parse(rdr);<br />
                    }<br />
                }<br />
                catch (Exception)<br />
                {<br />
                    MessageBox.Show("Error opening file.", "File Input Error",<br />
                                     MessageBoxButtons.OK, MessageBoxIcon.Exclamation);<br />
                }<br />
            }<br />
        }

This works perfect, however if I have multiple files ( File0, File1, File2 .. etc ) I would like my method to loop through each file and process it. Is there an easy way of doing this.

Kind regards,

Re: Parsing each file in directory

Giorgi Dalakishvili14-Jun-07 3:57

Giorgi Dalakishvili

14-Jun-07 3:57

You can use Directory.GetFiles() to get all the files in the current directory. Then parse each file individually.

#region signature
my articles
#endregion

Re: Parsing each file in directory

Jimmanuel14-Jun-07 3:58

Jimmanuel

14-Jun-07 3:58

foreach (string fileName in Directory.GetFiles("path to the directory of files"))
{
    // do whatever
}

Re: Parsing each file in directory

Rick van Woudenberg14-Jun-07 8:36

Rick van Woudenberg

14-Jun-07 8:36

Thank you guys , for your quick and accurate anwsers Smile | :)

Farm Database

sajid.salim.khan14-Jun-07 3:37

sajid.salim.khan

14-Jun-07 3:37

Do any of u have idea about the structure of a database for a farm any link or guidance

Alrizq

Re: Farm Database

Not Active14-Jun-07 4:00

Not Active

14-Jun-07 4:00

table: animal
colums: ID, type, num_of_legs, color

table: crops
columns: ID, type

INSERT INTO animal (type, num_of_legs, color) VALUES ('cow', 4, 'brown')
INSERT INTO animal (type, num_of_legs, color) VALUES ('dog', 3, 'black')

INSERT INTO crop (type) VALUES ('corn')
INSERT INTO crop (type) VALUES ('wheat')

only two letters away from being an asset

Re: Farm Database

originSH14-Jun-07 4:03

originSH

14-Jun-07 4:03

Re: Farm Database

DavidNohejl14-Jun-07 4:50

DavidNohejl

14-Jun-07 4:50

Mark Nischalke wrote:
INSERT INTO animal (type, num_of_legs, color) VALUES ('dog', 3, 'black')

pissing dog, huh? Big Grin | :-D

"Throughout human history, we have been dependent on machines to survive. Fate, it seems, is not without a sense of irony. " - Morpheus
"Real men use mspaint for writing code and notepad for designing graphics." - Anna-Jayne Metcalfe

Re: Farm Database

Guffa14-Jun-07 7:57

Guffa

14-Jun-07 7:57