I've fixed this by using "<MarshalAs(UnmanagedType.U4)> ByRef ppwzMimeOut As Integer" in the function decalre.. but I don't really understand why it works, probably because I don't really understand...

Can nobody help me with this?

I've posted the same question in six forums and no-one seems to know what I've done wrong in my coding. I'm sure it's a simple case of using the wrong variable type...

Hi,

I'm getting a casting error using the code below. The error on the web page (when you click the error icon) is:

Sys.WebForms.PageRequestManagerServerErrorExceptio n: Conversion from string...