TryGetUser(string userName) Method
  Syntax
  
    public
    virtual
    IUserDirectoryUser TryGetUser(string userName)
  Parameters
  
    - userName
 
    - Type: string
The user name of the user to look up.
 
  
 
  Returns
  
            A corresponding IUserDirectoryUser for the specified user name,
            if the user was found in the directory; otherwise null (Nothing in Visual Basic).
            
 
  Exceptions
  
    
      | 
        System.ArgumentNullException
       | 
      
         
          userName is null (Nothing in Visual Basic) or empty. 
       |