using string as control id in C# ASP.NET

Question

i have a page with 2 textbox items and a button textbox1 contains a word , and textbox2 is empty

now i want to put content of TextBox1.Text in TextBox2.Text with button click,

i tried:

protected void Button1_Click(object sender, EventArgs e) 
{ Page.FindControl("TextBox2").Text = TextBox1.Text; }

this code don't work ,how to make this work?

FindControl does not recursively search containers so maybe it is not a direct child of Page. Why not just TextBox2.Text = TextBox1.Text; ? — Crowcoder
– Crowcoder, Commented Feb 1, 2023 at 2:03
real use case is more complicated and will take long lines to describe , is there any other valid method ? , in windows forms i used to do: this.Controls.Find("textBox2", true)[0].Text = textBox1.Text; , but this don't work in asp.net — fateh
– fateh, Commented Feb 1, 2023 at 2:06

Naser Hamdan · Accepted Answer · 2023-02-02 13:30:36Z

1

TextBox textbox2= (TextBox)FindControlRecursive(Page, "TextBox2");

try using this, referencing this article

answered Feb 2, 2023 at 13:30

Naser Hamdan

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mo fa · Accepted Answer · 2023-02-03 22:47:27Z

0

you need to define it first then apply properties

protected void Button1_Click(object sender, EventArgs e) 
{ 
    TextBox textBox2 = (TextBox)Page.FindControl("TextBox2");
    textBox2.Text = TextBox1.Text; 
}

answered Feb 3, 2023 at 22:47

mo fa

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