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In the end it seems it's not a threadng problem, but my question was threading related, so I thank you for the answer. 
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In the end it seems it's not a threadng problem, but my question was threading related, so I thank you for the answer.

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I have an application that uses 2 threads, one for calculations and one for displaying an UI. I need to call a method that is in the calculation thread from the UI thread. When I call methods located in the UI thread from the calculation thread I use Invoke, but the other way around is not working.
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I have an application that uses 2 threads, one for calculations and one for displaying an UI. I need to call a method that is in the calculation thread from the UI thread. When I call methods located in the UI thread from the calculation thread I use Invoke, but the other way around is not working.

Call method from a different thread

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.