The class name '?' is not a valid identifier for this language.

Question

Hi Could anybody help me please why I got this error in View Designer of the Windows form: The class name '?' is not a valid identifier for this language. and how to resolve it? Thank you very much in advance.

Vulpes · Answer

On the face of it you're trying to give some entity a class name of '?' in the VS windows forms designer. This isn't allowed because the class name will be translated to an identifier and in C# all identifiers must consist of only letters digits or underscores and must begin with either a letter or an underscore.