private void btn_Login_Click(object sender, EventArgs e) { //bll.Authentication(txt_Username.Text, txt_Password.Text); int ReturnValues = bll.Authentication(txt_Username.Text, txt_Password.Text); //int ReturnValues = 0; if (ReturnValues > 0) { MainPage main = new MainPage(); main.Show(); this.Hide(); } else { MessageBox.Show("Incorrect username or password", "Attention", MessageBoxButtons.OK, MessageBoxIcon.Information); } }