private void btnRegForm_Click(object sender, EventArgs e)
{
string regFirstname = txtRegFirstname.Text;
string regSurname = txtRegSurname.Text;
string regUser = txtRegUsername.Text;
string regPass = hash.HashPassword(txtRegPassword.Text);
AddData ad = new AddData();
ad.AddStaff(regFirstname, regSurname, regUser, regPass);
MessageBox.Show("Registration Successful. Please Login");
this.Close();
}