I am developing desktop application in WPF on .NET Framework 4.0, because of Windows XP on some client computers.
I need async/await in .NET 4.0 so I added references to Microsoft.Bcl.Async (latest NuGet release). Anytime I use Async/Await keyword, program crashes with following exception when started in Windows XP (works in Windows 7+):
Could not load file or assembly 'System.Core, Version=126.96.36.199, Culture=neutral, PublicKeyToken=7cec85d7bea7798e, Retargetable=Yes' or one of its dependencies. The given assembly name or codebase was invalid. (Exception from HRESULT: 0x80131047)
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