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Glad to hear you got it working! The reason it doesn't update is explained in the documentation: https://www.ni.com/docs/en-US/bundle/labview/page/loading-net-assemblies.html#d62572e60

Welcome to the LAVA! Wire your struct to a Property Node to access public properties and fields. You can set it to either read or write a value. Please be careful when changing signatures. LabVIEW does not automatically detect when the type of an argument changes. You'll have to manually update all calling sites to match the new signature which can lead to bad behavior. That said, calling by ref or by value both work. Here is a complete example for both of them: namespace DemoLib { public struct MyStruct { public string Message { get; set; } public int Number { get; set; } } public class MyClass { public string GetMessage(MyStruct data) { return data.Message; } public int GetNumber(MyStruct data) { return data.Number; } public string CreateMessageByRef(ref MyStruct data) { data.Message = "Hello from CreateMessageByRef"; return data.Message; } public int CreateNumberByRef(ref MyStruct data) { data.Number = 42; return data.Number; } } } Example.vi