Dev Express v10.1 Compilation Error Message: CS0012

CS0012: The type ‘DevExpress.Utils.IAssignableCollection’ is defined in an assembly that is not referenced. You must add a reference to assembly ‘DevExpress.Data.v10.1, Version=10.1.6.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a’.

check your web.conf file whether the said “DevExpress.Data.v10.1, Version=10.1.6.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a” entry exists or not. if not just add and recompile. Usually when you add any DevExpress controls to your form Visual Stuido automatically adds the entries as above. if you replaced the web.conf file with another due to so many reasons this used to happen.

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