protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) { DataSet ds = new DataSet(); DataSet ds1 = new DataSet(); DataSet ds2 = new DataSet(); string username = Convert.ToString(Session["username"]); int status = Convert.ToInt32(DropDownList1.SelectedValue); if (status == 0) { ScriptManager.RegisterStartupScript(Page, Page.GetType(), "ss", "<script>alert('Please select the Status')</script>", false); } else if (status == 1) { ds = obj.GetOpenOrderHistory(username); if (ds != null) { GridView2.DataSource = ds; GridView2.DataBind(); GridView2.Visible = true; GridView1.Visible = false; } else { ScriptManager.RegisterStartupScript(Page, Page.GetType(), "ss", "<script>alert('No Data Found')</script>", false); } } else if (status == 2) { ds1 = obj.GetClosedOrderHistory(username); if (ds1 != null) { GridView1.DataSource = ds1; GridView1.DataBind(); GridView1.Visible = true; GridView2.Visible = false; } else { ScriptManager.RegisterStartupScript(Page, Page.GetType(), "ss", "<script>alert('No Data Found')</script>", false); } } else if (status == 3) { ds2 = obj.GetFailedOrderHistory(username); if (ds2 == null) { ScriptManager.RegisterStartupScript(Page, Page.GetType(), "ss", "<script>alert('No Data Found')</script>", false); } else { GridView2.DataSource = ds2; GridView2.DataBind(); GridView2.Visible = true; GridView1.Visible = false; } } else { } }