private void searchbtn_Click(object sender, EventArgs e) { if (typecb.Text != "") { dataGridView1.DataSource = lc.getCustomerMembershipByMID(Convert.ToInt32(typecb.SelectedValue)); dataGridView1.Columns[0].Width = 70; dataGridView1.Columns[1].Width = 200; dataGridView1.Columns[2].Width = 140; } else { MessageBox.Show("Please Select any Type First or Click Search All", "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation); } }