//Search button private void button1_Click_1(object sender, EventArgs e) { DataTable dt; deaf d = new deaf(textBox1.Text, textBox2.Text, textBox3.Text, textBox4.Text, textBox5.Text); //deaf d = new deaf(textBox1.Text); dt = d.UpdateExssisDeaf(); //DataTable s = d.getDeafName(); if (dt != null) { MessageBox.Show("is Exite"); textBox2.Text = dt.Rows[0]["name"].ToString(); //textBox2.Text = s.ToString(); //textBox2.Text = dt.Rows[0]["name"].ToString(); textBox3.Text = dt.Rows[0]["email"].ToString(); textBox4.Text = dt.Rows[0]["Username"].ToString(); textBox5.Text = dt.Rows[0]["Password"].ToString(); textBox1.Enabled = false; panel1.Visible = true; } else { MessageBox.Show("is not Exite"); textBox1.Enabled = true; } }