Can not access dynamically created control.

arnab-jit · June 8th, 2011, 08:48 AM

I am creating a web site, in that I have created a textbox in a placeholder dynamically. But the problem is I can not access the text of the textbox in another method.

I have one button for create textbox and another button for reading the text of the textbox.

Event handler method of the create control button.

Code:

protected void Button1_Click(object sender, EventArgs e)
    {
        TextBox myText = new TextBox();
        myText.Text = "Hello world";
        PlaceHolder1.Controls.Add(myText);
    }

and Event handler method of the read text button

Code:

protected void Button2_Click(object sender, EventArgs e)
    {
        Response.Write(((TextBox)PlaceHolder1.FindControl("myText")).Text);
    }

In this code when i am trying to access the textbox inside placeholder, i am getting null reference exception. That means
placeholder has no control in it.

When i debug it, i get PlaceHolder1.Controls.Count is 0.

Why the control collection is empty? Is viewstate is not working? How to solve the problem?

Please help...

Imar · June 8th, 2011, 04:30 PM

Dynamically created controls are not peristed in ViewState, only their data.

To make this work you need to create the controls in PreInit, on both a normal request as well as during a post back.

Cheers,

Imar