Comments by Mohit1984 (Top 2 by date)

when i use this code then error comes like
Object reference not set to an instance of an object.

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
TextBox txt = e.Row.FindControl("TextBox1") as TextBox;
txt.TextChanged += new EventHandler(TextBox1_TextChanged);

}