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After a 20 year hiatus, I'm back to writing text code again. Not just any text code, but C# .NET assemblies. After about a day and a half of googling and self teaching, I've hit the wall. I've got a .NET assembly that was provided by a manufacturer that controls some hardware. We are calling the higher level .NET functions from Labview and they work. But we aren't getting acceptable performance for the high level calls, so we are trying to drill down into the lower level calls. One of the .NET methods requires an ICollection<T> input, there in this case T is a channel object that is created elsewhere. The ICollection function is described the in the MSDN article: http://msdn.microsoft.com/en-us/library/92t2ye13 For reasons I don't really understand, Labview doesn't apparently support a constructor to ICollection. Something about Labivew not supporting calls to .NET generics, but I'd be lying if I said I understood that. But it seems like it should be possible to create a .NET assembly that creates a reference to an ICollection .NET object that can be passed to Labview. But I can't get it to work. I've written a simple program that contains two methods. The first method GetUInt32 simply returns an input integer and was written as a test to see if I could write and assembly and call it from Labview. It works great. The second method, GetICollection, is a test case to create a collection of UInt32 integers. Should be really simple, but it generates a compiler error. I suspect I'm doing something really basic incorrectly, but I'm at a loss to understand what. Can someone point me in the correct direction?