private void closeToolStripMenuItem_Click(object sender, EventArgs e)
 {
     //START SHOW ADD CLIENT FORM
     admin admin = new admin();
     admin.Show();
     this.Hide();
     //END SHOW ADD CLIENT FORM
 }
        private void button1_Click(object sender, EventArgs e)
        {
            if (validUser(textBoxUsername.Text, textBoxPassword.Text))
            {
                Properties.Settings.Default.username = textBoxUsername.Text;

                //START SHOW ADMIN FORM
                admin frm = new admin();
                frm.Show();
                //END SHOW ADMIN FORM
                this.Hide();
            }
            else
            {
                MessageBox.Show("Incorrect Username or Password, Please Try Again");
            }
        }
 private void closeToolStripMenuItem_Click(object sender, EventArgs e)
 {
     //START SHOW SIGN IN FORM
     admin admin = new admin();
     admin.Show();
     //END SHOW SIGN IN FORM
     this.Close();
 }