Question

I want to use the following method.

private void LocationChange(Object obj, int first, int second) 
{ 
     // so then if i say 

    obj.Location = new Point(first,second);
}

but this won’t work for me is there a way around this?

Thanks for the help

Answer 1

Since Location is a property of Control, you ought to make the parameter of that type:

private void LocationChange(Control control, int first, int second) 
{ 
    control.Location = new Point(first,second);
}

You can then pass any type that subclasses Control into that method.

I’m not sure why you would allow any object to be passed into the method if it’s meant to operate on a Control specifically, but if you had some other, non-control-specific logic in there, you could cast the parameter, like so:

private void LocationChange(Object obj, int first, int second) 
{ 
    // Logic that operates on the object regardless of its type goes here...
    // Although I'm not sure what that logic would be. :)

    // This check works since .NET 2.0 (I believe?) and lets you avoid 
    // an InvalidCastException if obj happens NOT to be a subclass of Control...
    if(obj is Control)
    {
        ((Control)obj).Location = new Point(first,second);
    }
}