Matrix mtr = Matrix.GetFromUID(pVal.Form, "38"); for(int i = 0; i < mtr.Rows.Count - 1; i++) { if(mtr.GetValue("43", i).ToString() == "17") { MessageBox.Show("Direct Copy from Sales Order to A/R Invoice or A/R Reserve Invoice is not allowed. Please book a Delivery first.", "OK"); return false; } if(mtr.GetValue("43", i).ToString() == "23") { MessageBox.Show("Direct Copy from Sales Quotation to A/R Invoice or A/R Reserve Invoice is not allowed. Please book Sales Order and Delivery first.", "OK"); return false; } } return true;