private void btndelete_Click(object sender, System.EventArgs e) { int InvoiceID = Convert.ToInt32(Request.QueryString["InvoiceID"].ToString()); string Category = Request.QueryString["InvoiceType"]; Invoice.Invoice objinvoice = new Invoice.Invoice(); if (objinvoice.Deleteinvoicecreditnote(InvoiceID, Category)) { lblMessege.Text = "Deleted successfully"; Response.Write("<script>alert('Invoice deleted successfully');</script>"); Response.Write("<script>opener.location.reload(true);</script>"); Response.Write("<script>self.close();</script>"); } else { lblMessege.Text = "Error in deleting document."; } }