is it a good idea to create an enum for the key names of session values?

Question

instead of doing

 session(\"myvar1\") = something
 session(\"myvar2\") = something
 session(\"myvar3\") = something
 session(\"myvar4\") = something

Answer 1

How about:-

public static class  SessionVar
{
  public static readonly string myVar1 = "myVar1";
  public static readonly string myVar2 = "myVar2";
  public static readonly string myVar3 = "myVar3";
  public static readonly string myVar4 = "myVar4";
}

This allows you to use:-

session(SessionVar.myVar1) = something;