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

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.

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.