private void CheckIfExist(PrepAndPaintModel newJob) { List <PrepAndPaintModel> prepAndPaintModels = PrepAndPaintDB.GetNewData(); foreach (var item in prepAndPaintModels) { if (item.JobNumber == newJob.JobNumber && item.BodyOrDoors == newJob.BodyOrDoors) { MessageBox.Show($"Item: {newJob.BodyOrDoors} already exist for Job# {newJob.JobNumber} in the database!", "Entry Exist!", MessageBoxButtons.OK, MessageBoxIcon.Error); return; } } PrepAndPaintDB.AddnewJob(newJob); jobId = newJob.Id; DialogResult = DialogResult.OK; Close(); }