Difference Between Pass by reference and pass reference Type

(1)

 void Fun(int[] Arr)
    {
        Arr[0] = 888;  // This change affects the original element.
        Arr = new int[5] {-3, -1, -2, -3, -4};   // This change is local.

                           // Because two different refernece is created 
        System.Console.WriteLine("the first element is: {0}", Arr[0]);

    }

static void Main() 
    {
        int[] arr = {1, 4, 5};
        Fun(ref arr); // Call above method
    }

In this case two reference is created. Ref1 and Ref2 are both are pointed 
 to same object. You can change Reference point object by "New" Keyword. 

(2)

 static void Fun(ref int[] Arr) {
   // Both of the following changes will affect the original variables:
    Arr[0] = 888;
     Arr = new int[5] {-3, -1, -2, -3, -4};
     System.Console.WriteLine("the first element is: {0}", pArray[0]);
   }
 static void Main() {
     int[] arr = {1, 4, 5};
      Fun(ref arr);
}
Above case only one reference is created. "New" keyword is 
change original object.