private void button3_Click(object sender, EventArgs e)
        {
            viewadmin od = new viewadmin();

            od.Show();
            this.Hide();
        }
 private void button1_Click(object sender, EventArgs e)
 {
     if (textBox1.Text == "admin" && textBox2.Text == "password")
     {
         viewadmin o1 = new viewadmin();
         o1.Show();
         this.Hide();
     }
     else
     {
         MessageBox.Show("Invalid Login");
     }
     textBox1.Text = "";
     textBox2.Text = "";
 }