public void createtable()
{
tb.Columns.Add("Product Name", typeof(string));
tb.Columns.Add("Number", typeof(string));
tb.Columns.Add("Description", typeof(string));
tb.Columns.Add("color", typeof(string));
tb.Columns.Add("List Price", typeof(string));
tb.Columns.Add("Category Name", typeof(string));
tb.Columns.Add("Model Name", typeof(string));
tb.Columns.Add("Quantity", typeof(string));
tb.Columns.Add("Total Price", typeof(string));
Gv1.DataSource = tb;
Gv1.DataBind();
ViewState["table1"] = tb;
}