public static void DisplayForm(Action action) {
    DisplayFormUsingInvoke(action);
}

public static void DisplayForm<T>(Action<T> action, T param) {
    DisplayFormUsingInvoke(action, param);
}

public static void DisplayForm<T,U>(Action<T,U> action, T param1, U param2) {
    DisplayFormUsingInvoke(action, param1, param2);
}

...

private static void DisplayFormUsingInvoke(Delegate d, params object[] parms) {
    // Edit this code to run it on the background thread, report progress, etc.
    d.DynamicInvoke(parms);
}