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Asked: 2026-05-11T10:30:24+00:00

Okay so I have a Window in WPF. I add the following line inside

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Okay so I have a Window in WPF. I add the following line inside of it:

xmlns:controls='clr-namespace:mCubed.Controls'

This compiles and runs just fine, but the Visual Studio designer gives me this error:

Could not load file or assembly ‘mCubed, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null’ or one of its dependencies. The system cannot find the file specified.

When I remove this line from the Window, it compiles and runs just fine and the Visual Studio designer works like a charm!

I’m confused as to why that one line breaks the designer? This occurs REGARDLESS if I have put the following line in the body of the XAML document.

<controls:MyControl/>

All my .cs files are in the same VS project. I have a mCubed namespace which contains my cleverly named mCubedWindow class. I have all my controls classes defined in the mCubed.Controls namespace. Do NOT tell me this is an assembly problem, ALL MY FILES ARE IN THE SAME VS PROJECT!

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1 Answer

  1. Not an assembly problem, just a designer problem. The VS WPF designer in 2008 is primitive at best – completely useless IMHO. I turn it off completely and use the XML editor instead. Hopefully things will improve drastically in 2010.

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