private void button1_Click(object sender, EventArgs e) { ReturnDA b = new ReturnDA(); ReturnBL a = new ReturnBL(); int code = 0; try { code = int.Parse(textBox1.Text); } catch (Exception ex) { MessageBox.Show(ex.Message); return; } bool test = a.checkMember(code); if (!test) { MessageBox.Show("Don't have this member in Database"); return; } else { DataSet ds = b.SelectDS(code); DataView dv = new DataView(ds.Tables[0]); dataGridView1.DataSource = dv; label5.Text = "" + ds.Tables[0].Rows.Count; textBox2.Text = b.getName(code); textBox3.Enabled = true; textBox3.Text = DateTime.Now.ToString("dd/M/yyyy"); button3.Enabled = true; textBox1.Enabled = false; button1.Enabled = false; } }