[ASP.NET C#] Iterate through dynamic controls

[wa22guy]

I have an ASP.NET C# web app that has a table dymanically created at run-time. In the table there are a number of dropdowns and textboxes created, depending on the number of Rows in the database.

My question is, how do I access these controls once the page is loaded? Here's some code I used to create them:

// makes the comments textbox and labels as txt[AccountID]
    	TextBox txt = new TextBox();
    	txt.TextMode = TextBoxMode.MultiLine;
    	txt.ID = "txt" + Convert.ToString(thisReader3.GetValue(6));
    	tcell.BorderColor = Color.FromArgb(215, 215, 255); // light blue
    	tcell.BorderWidth = 1;
    	tcell.VerticalAlign = VerticalAlign.Top;
    	tcell.HorizontalAlign = HorizontalAlign.Right;
    	tcell.Width = 152;
    	tcell.Controls.Add(txt); 
    	trow.Cells.Add(tcell);

    	tblDynamic.Rows.Add(trow);
    	thisReader3.Read();

[wa22guy]

Ok I found this code but it's not working... it's not finding my textbox controls on the page. Anyone know why?

void IterateThroughChildren(Control parent)
  {
  	foreach (Control c in parent.Controls)
  	{
    if (c.GetType().ToString().Equals("System.Web.UI.WebControls.TextBox"))
    {
    	string com = ((TextBox) c).ID.ToString();
    }
        
    if (c.Controls.Count > 0)
    {          
    	IterateThroughChildren(c);          
    }
  	}
  }

[Lazereth]

you are better of using "is typeof(inserttypehere)" rather than using the string signature of the relevant control. You'll also note that its perhaps better to check the interface rather than the control inself.

[Menge]

GetType() returns the top level class only... so it's good to check for the control type.

but... if you're checking this list on PostBack, then you should know that probably your controls aren't there. you have to either REbuild them or add them to the page state, so they are persistent. runtime-created controls aren't persistent, by default.

[wa22guy]

  Menge said:

GetType() returns the top level class only... so it's good to check for the control type.

but... if you're checking this list on PostBack, then you should know that probably your controls aren't there. you have to either REbuild them or add them to the page state, so they are persistent. runtime-created controls aren't persistent, by default.

586124298[/snapback]

Thanks! How do I add them to the page state dynamically?

[wa22guy]

  Lazereth said:

you are better of using "is typeof(inserttypehere)" rather than using the string signature of the relevant control. You'll also note that its perhaps better to check the interface rather than the control inself.

586124289[/snapback]

Can you give me an example of how the code would look instead? Thanks!

[Menge]

http://www.codeproject.com/aspnet/PersistentStatePage.asp

this should help you :)

[wa22guy]

  Menge said:

http://www.codeproject.com/aspnet/PersistentStatePage.asp

this should help you :)

586124349[/snapback]

Yikes! Ok I'll give it a read.

[wa22guy]

I found an even better article about this....

http://aspnet.4guysfromrolla.com/articles/092904-1.aspx