An identifier is a name used to identify a class, variable, function, or any other user-defined item. The basic rules for naming classes in C# are as follows −
A name must begin with a letter that could be followed by a sequence of letters, digits (0 - 9) or underscore. The first character in an identifier cannot be a digit.
It must not contain any embedded space or symbol such as? - + ! @ # % ^ & * ( ) [ ] { } . ; : " ' / and \. However, an underscore ( _ ) can be used.
It should not be a C# keyword.
The following are some examples of identifiers −
Class Names
class Calculation class Demo
Valid Functions Names
void display() void getMarks()
Variable Names
int a; int marks; int rank; double res_marks;