Question

I have a textbox on an ASP.NET 4.0 page. I can add text to the textbox in the code-behind and when the page renders, the text displays just fine. However, when I modify the textbox in the browser and submit the page, the MyTextBox.Text property still shows the original text and not the modifed text I entered in the browser. How can the code-behind show the modified text?

Answer 1

You need to check for a postback in your initial textbox, like this:

if(!Page.IsPostBack)
{
   MyTextBox.Text = "This is the text when page renders";
}

You can set your textbox normally in the code behind for the submit button handler.

void SubmitButton_Click(Object sender, EventArgs e)
{
    MyTextBox.Text = tbUserInputHere.Text;
}