private void cmdLogin_Click(object sender, EventArgs e)
{
bool is_valid;
bool validate;
server.Service1 server = new server.Service1();
server.Login(txtUsername.Text, txtPassword.Text, out is_valid, out validate);
if (is_valid == true)
{
this.Hide();
UserPortal up = new UserPortal();
up.Show();
}
else
{
MessageBox.Show("Invalid username and password.");
}
}