Error when no even elements in the array

sir, simply check for null before calling any singleton method whether it be single(), Min(),Max() or Sum()

1. if(myNumbers.where(x=>x%2==0).Count()==0)  
2. {  
3. cw("No element");  
4. }  
5. else  
6. {  
7. Console.WriteLine("max even elements:" + myNumbers.Where(n => n % 2 == 0).Max());  
8. }