Zulfiqar Said..
These are the rules for naming classes in c sharp.
1) Must begin with a letter. This letter may be followed by a sequence of letters, digits (0-9), or ‘_’. The first character in a class name cannot be a digit.
2) Must not contain any embedded space or symbol like ? - + ! @ # % & * ( ) { } [ ] , : ; ‘ “ \ and/. However an underscore _ can be used wherever a space is required.
3) Must not use a keyword for a class name.