dynamically added Textbox's text

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Am adding a textbox to a panel(panel1) dynamically on click of a button add

And want to retrieve its value on lcick of a button (btnretrive)

but an exception is thrown saying panel1 doesnot contain any controls.

help me on this

Posted 4-Apr-11 20:32pm

sekharkaza

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OriginalGriff · Answer 1 · 2011-04-04T20:41:00

Solution 3

Without your code, it is difficult to comment accurately on what is wrong with it! Instead, I would use this code to add the textbox to my panel:

TextBox tb = new TextBox();
tb.Width = 100;
tb.Height = 50;
tb.Location = new Point(10,10);
tb.Text = "My New TextBox";
myPanel.Controls.Add(tb);

And I would use this code to access it:

foreach(Control c in myPanel.Controls)
   {
   TextBox tb = c as TextBox;
   if (tb != null)
      {
      Control.WriteLine(tb.Text);
      }
   }

What are you doing that is different?

Posted 4-Apr-11 20:41pm

OriginalGriff

Comments

m@dhu 5-Apr-11 2:51am

From OP:OriginalGriff,

IN the second code that you have given myPanel.Controls give null to me or myPanel.Controls.Count =0

Olivier Levrey 5-Apr-11 3:39am

If myPanel.Controls is null, it means you forgot myPanel.Controls.Add(...).
Have a 5 OriginalGriff.

OriginalGriff 5-Apr-11 4:04am

Then we need to see the relevant code fragments. Where are you declaring your Panel? In the Designer, or in code? If in code, we need to see that. We need to see the two button click handlers code exactly as you have them in your program - copy and paste them here so we can comment.

sekharkaza 5-Apr-11 5:14am

Code is very simple.Point is on a button click am adding textbox control to panel(panel.controls.add(txtbox1))

On any other postback(i.e., click of btnretrieve, or any other click) am loosing those controls from the panel(because they were not added in pageload but addd later in a button click ).

Now my question is how to retain those controls in a postback.

OriginalGriff 5-Apr-11 5:29am

Oh dear.
You do realize that doesn't work?
When you create dynamic controls in a webpage, rather than a winform, they only exist in the codebehind for the life of the page load. When you get the postback, the page is reloaded as far as the codebehind is concerned and they never existed - your panel reports empty, because it is empty.
Help is at hand, but you will have to do a fair amount of reading @ MSDN: http://msdn.microsoft.com/en-us/library/ms972976

Abhinav S · Answer 2 · 2011-04-04T20:35:00

Solution 1

This link [^]discusses looping through controls and may be a help to you.

Posted 4-Apr-11 20:35pm

Abhinav S

Mahendra.p25 · Answer 3 · 2011-04-04T20:37:00

Solution 2

try this Link
Link [^]

Posted 4-Apr-11 20:37pm

Mahendra.p25