The type 'System.Windows.VisualStateManager' exists in both 'c:\.. (x86)\Reference Assemblies\Microsot\Framwork\.NETFramework\v4.5\PresentationFramework.dll' and 'c:\...\dlls\Calendar\WPFToolkit.dll'

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Please Solve This Problem

[Fixed formatting, added this line to allow posting of the content which otherwise would be too short — SA]

Posted 20-Jun-15 21:47pm

deilam1

Updated 20-Jun-15 22:35pm

Sergey Alexandrovich Kryukov

v2

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Kornfeld Eliyahu Peter · Answer 1 · 2015-06-20T22:30:00

Solution 2

You are using the 4.5 framework version of WPF and an older version of controls (fit for 3.5 SP1), why?
You should choose the one you really want to use and remove the other - that will also remove the error message...

Posted 20-Jun-15 22:30pm

Kornfeld Eliyahu Peter

Sergey Alexandrovich Kryukov · Answer 2 · 2015-06-20T22:25:00

The top-level types of different assemblies with identical full names can still be resolved using extern alias:
https://msdn.microsoft.com/en-us/library/ms173212.aspx[^].

This MSDN help page only explains the compiler command-line syntax, which you don't directly use with the IDE. So, in addition to this information, you need to know how to do it in Visual Studio. Here is how: in Solution Explorer, select one of the referenced assembly nodes (one of the children of the node "References" of the project), activate "Properties" of the referenced assembly node (through the context menu) and add an alias to the property "Aliases".

—SA