# C# wrapper demo callback **URL:** \ **Category:** Windows\ **Created:** [July 27, 2020, 5:24am UTC](https://devforum.zoom.us/t/c-wrapper-demo-callback/25284 "2020-07-27T05:24:54Z")\ **Posts on this page:** 1\ **Showing post:** 16
**Author:** ![jean-jacques.lutz](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/jean-jacques.lutz/32/20111_2.png) [@jean-jacques.lutz](https://devforum.zoom.us/u/jean-jacques.lutz)\ **Post date:** [August 3, 2021, 3:57pm UTC](https://devforum.zoom.us/t/c-wrapper-demo-callback/25284/16 "2021-08-03T15:57:46Z")
You might want to have a look here. It worked for me, and the proposed solution is so simple (It seems as if we need to rebuild the wrapper). > [@C# wrapper demo client authorization callback not being called](https://devforum.zoom.us/t/c-wrapper-demo-client-authorization-callback-not-being-called/49983/10): > > I was able to solve this problem. Procedure Unzip zoom-c-sharp-wrapper-5.5.12511.0422.zip (Start with a clean sln) Open the file zoom\_sdk\_c\_sharp\_wrap.sln in VisualStudio Change project configuration to Release, change platform to x86 Build the solution Right-click on “zoom\_sdk\_demo” in the Solution Explorer after the build is finished Click “Set as StratUp Project” Click Start (in Visual Studio) MainWindow.xaml is shown Input token and Click Auth The guide says “Open the demo project by cli… --- _[View the full topic](https://devforum.zoom.us/t/c-wrapper-demo-callback/25284)._