Enumerable.concat Method
        
 Concatenates two sequences.
 
         
         
        
            
 This method is static. 
        Parameters
        
            - first
            
 
            - 
                
Type: IEnumerable
The first sequence to concatenate. 
            - second
            
 
            - 
                
Type: IEnumerable
The sequence to concatenate to the first sequence. 
        
        Return Value
        
Type: IEnumerable
        
An enumerable that contains the concatenated elements of the two input sequences.