private void button1_Click(object sender, EventArgs e) { if (textBox1.Text == "")//validation part { MessageBox.Show("Please, insert Branch ID to delete"); } else { int r = EmC.DeleteBranch(Convert.ToInt32(textBox1.Text)); if (r == 0) { MessageBox.Show("Your Request is Invalid"); } else { MessageBox.Show("The Branch was Delete Successfully!"); } } }