Enumerable.distinct Method
        
 Returns distinct elements from a sequence by using the equality comparer to compare values.
 
         
         
        
            
 This method is static. 
        Parameters
        
            - source
            
 
            - 
                
Type: IEnumerable
The sequence to remove duplicate elements from. 
            - equalityComparer
            
 
            - 
                
Type: IEqualityComparer
An equality comparer to compare join keys.
Optional: True 
        
        Return Value
        
Type: IEnumerable
        
An enumerable that contains distinct elements from the source sequence.