Unhandled AccessViolationException Error calling a DLL into VB.Net?

The declaration is simply wrong, this resembles a vb6 declaration. An int in C code is an Integer in vb.net, not a Long. The Xdata and Ydata are highly likely to be arrays, not a byref double.

Declare them as ByVal Double(). The other byref args are harder to guess.

P-invoke is platform invoke, and is how you call into native APIs with .NET. Your declaration is not currently setup to pass arrays, and it should not be done ByRef.

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