private void buttonDelete_Click(object sender, EventArgs e) { if (ValidateEmptyTextBox(1) && !string.IsNullOrEmpty(textBoxCustomerID.Text)) { if (MessageBox.Show("Do You Want to Delete this Record", "Delete", MessageBoxButtons.YesNo) == DialogResult.Yes) { SalesManager salesManager = new SalesManager(); salesManager.CustomerID = Convert.ToInt32(textBoxCustomerID.Text); if (salesManager.DelRecord(dsProject, dtCustomer, salesManager)) { MessageBox.Show("Deletion Completed."); } else { MessageBox.Show("Deletion Is Not Completed.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } this.ClearTextBox(); } } else { MessageBox.Show("Please Select a Row For Delete Operation."); } }