Enumerable.last Method
        
 Returns the last element of the sequence.  If "predicate" is provided,
 returns the last element that satisfies that condition.
 
         
         
        
            
 This method is static. 
        Parameters
        
            - source
            
 
            - 
                
Type: IEnumerable
The enumerable to return the last element of. 
            - predicate
            
 
            - 
                
Type: Function
A function to test each element for a condition, returning true or false.
Optional: True 
        
        Return Value
        
Type: Object
        
The last element of the sequence that satisfies the specified condition.