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Why is this an issue?
Since C# 5.0, async and await are contextual keywords. Contextual keywords
do have a particular meaning in some contexts, but are not reserved and therefore can be used as variable names.
int await = 42; // Noncompliant, but compiles
int async = 42; // Noncompliant, but compiles

Keywords, on the other hand, are always reserved and
therefore are not valid variable names.
int abstract = 42; // Error CS1585: Member modifier 'abstract' must precede the member type and name
int foreach = 42; // Error CS1519: Invalid token 'foreach' in class, struct, or interface member declaration

To avoid any confusion, it is best to not use async and await as identifiers.
int someVariableName = 42;
int someOtherVariableName = 42;

Resources
Documentation

  
 Contextual Keywords - MSDN 
  
 Asynchronous programming - MSDN