Unable to access values of Dynamically added controls

Question

0.00/5 (No votes)

See more:

I am adding textbox and fileupload control runtime by this way-
for (int i = 0; i < no; i++)
{
FileUpload fileup = new FileUpload();
TextBox txt = new TextBox();
fileup.ID = i.ToString();
pnlupload.Controls.Add(txt);
pnlupload.Controls.Add(fileup);
}
Then I want to save values of Text box and File upload. But, It's not working.Help Me.

Posted 18-Mar-13 1:46am

pal89

Add a Solution

Comments

Andy Lanng 18-Mar-13 7:48am

You have kindly posted the code for creating the controls but could you please post the code you have tried to retrieve these controls. Thanks

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Braj_12 · Answer 1 · 2013-03-18T02:19:00

Solution 1

Please improve your code like this

for (int i = 0; i < 4; i++)
{
FileUpload fileup = new FileUpload();
TextBox txt = new TextBox();
txt.ID = "txt" + i.ToString();//Specify ID for your control
fileup.ID = "FileU"+i.ToString();//Specify ID for your control
Panel1.Controls.Add(txt);
Panel1.Controls.Add(fileup);
}

and Then try code given below for accessing the values of your controls

TextBox tb = (TextBox)Panel1.FindControl("txt1");
string tx = tb.Text;
FileUpload fb = (FileUpload)Panel1.FindControl("FileU1");
string nam= fb.FileName;

Posted 18-Mar-13 2:19am

Braj_12

v2

Comments

pal89 18-Mar-13 8:31am

object of textbox tb, object of fileUpload fb, are getting NULL values. so throws exception.

Braj_12 18-Mar-13 8:36am

where are you accessing these controls values ..I have accessed on the click of button event.

Braj_12 19-Mar-13 6:07am

I am adding these dynamic controls on form load in panel1 and on click of button i can find all the controls.

CHill60 19-Mar-13 6:07am

It's because the ID is not persisted between post backs - the solution will only work if the creation of the controls and the reading of the content are in the same function in the code-behind - an unlikely position.
Have a look at this article to fix the problem http://www.codeproject.com/Articles/3684/Retaining-State-for-Dynamically-Created-Controls-i