TextChanged not firing:

    protected void TextBoxA_TextChanged(object sender, EventArgs e)
    {
        TextBox textboxA = (TextBox)FormView1.FindControl("TextBoxA");       
        TextBox textboxB = (TextBox)FormView1.FindControl("TextBoxB");
        textboxB.Text=textboxA.Text;
        
    }

Be sure that you have set AutoPostBack to TRUE in your TextBox to fire up the event

Hi asdpai,

We should set Textbox autopostback property to true and offer a textchanged event handler in codefile.

And we should find textbox at the following method.

    protected void TextBoxA_TextChanged(object sender, EventArgs e)
    {
        TextBox textboxA = (TextBox)FormView1.Row.FindControl("TextBoxA");       
        TextBox textboxB = (TextBox)FormView1.Row.FindControl("TextBoxB");
        textboxB.Text=textboxA.Text;
        
    }