protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{//remove a item from cart
Int32 index = System.Convert.ToInt32(e.CommandArgument);
string pname = GridView1.Rows[index].Cells[1].Text;
string user = Session["user"].ToString();
dba.RemoveAItemFromCart(user.ToLower(), pname.ToLower());
Response.Redirect("~/cart.aspx");
}