How to display a messagebox for showing message when wrong password has been entered?

[Gopal Sharma akki]

msgbox("wrong password");

[marcellus7]

Thats how you show a message box, but where are you checking for the wrong password?

[Gopal Sharma akki]

i want to display a messagebox on a button click when i have entered a wrong password. what syntax should be used for the messagebox on a button click?

[Plater]

MessageBox.Show ("This is a message");