How to Change Gridview TextBox Value.

Hi

I have post the Code after Gridview Bind Change the TextBox value.


protected void Bt_Submit_Click(object sender, EventArgs e)
{

int i=1;
foreach(GridViewRow grv in Grd1.Rows)
{
TextBox txt1 = (TextBox)grv.FindControl("Txthead");
txt1.Text = "ZZZ"+i;
i++;
}

}