Working with Integer Arrays

Console.WriteLine has 19 overloads:

http://msdn.microsoft.com/en-us/library/System.Console.WriteLine.aspx

Console.WriteLine(a) invokes the overload which takes an 'object' parameter, as there is no better alternative. This overload applies the ToString() method to the object parameter which in this case simply prints the name of the actual type which is System.Int32[].

However, Console.WriteLine(b) invokes the overload which takes a char[] parameter, which is obviously the best fit. This overload writes the individual chars of the array, one after the other, to the console and therefore prints 'abc' in this case.

Because in C# arrays are actually objects. The char datatype however is a value type and not a reference type like int.