protected void Button1_Click(object sender, EventArgs e)
{
CustomerMethods cm = new CustomerMethods();
int id = Convert.ToInt32(cid.Text);
List <Customerbo> list = new List <Customerbo>();
list = cm.ViewCustomerById(id);
GridView1.DataSource = list;
if (list.Count() == 0)
{
Response.Write("<script>alert('Customer Id doesnt exist')</script>");
}
GridView1.DataBind();
}