Checks if MD5OfMessageAttributes property is set
            
 Declaration Syntax
 Declaration Syntax| C# | 
public bool IsSetMD5OfMessageAttributes()
 Return Value
 Return Valuetrue if MD5OfMessageAttributes property is set
 Declaration Syntax
 Declaration Syntax| C# | 
public bool IsSetMD5OfMessageAttributes()
 Return Value
 Return Value