private void button1_Click(object sender, EventArgs e) { button2.Enabled = false; button1.Enabled = false; textBox1.Enabled = false; textBox2.Enabled = false; SqlClass SqlFucntion = new SqlClass(); if (SqlFucntion.checkUserLogin(textBox1.Text, textBox2.Text)) { MessageBox.Show("เข้าสู่ระบบสำเร็จ", "ดำเนินการสำเร็จ"); Userinformation Userinformation = new Userinformation(); Userinformation.ID = textBox1.Text; Userinformation.loadInfo(); Userinformation.Show(); button2.Enabled = true; button1.Enabled = true; textBox1.Enabled = true; textBox2.Enabled = true; this.Hide(); } else { MessageBox.Show("เข้าสู่ระบบล้มเหลว", "ดำเนินการล้มเหลว"); button2.Enabled = true; button1.Enabled = true; textBox1.Enabled = true; textBox2.Enabled = true; } }