How can i shuffle a list

Try that : listRand.Sort((a, b)=> 1 - 2 * Random.Range(0, 1));

     //================================================================//
     //===================Fisher_Yates_CardDeck_Shuffle====================//
     //================================================================//
 
     /// With the Fisher-Yates shuffle, first implemented on computers by Durstenfeld in 1964, 
     ///   we randomly sort elements. This is an accurate, effective shuffling method for all array types.
 
     public static List<GameObject> Fisher_Yates_CardDeck_Shuffle (List<GameObject>aList) {
 
         System.Random _random = new System.Random ();
 
         GameObject myGO;
 
         int n = aList.Count;
         for (int i = 0; i < n; i++)
         {
             // NextDouble returns a random number between 0 and 1.
             // ... It is equivalent to Math.random() in Java.
             int r = i + (int)(_random.NextDouble() * (n - i));
             myGO = aList[r];
             aList[r] = aList[i];
             aList[i] = myGO;
         }
 
         return aList;
     }

A quick google search yielded this: http://stackoverflow.com/questions/273313/randomize-a-listt-in-c-sharp

  after a little search this is how I got mine to work... 
  Maybe it helps somebody else :)  
 
 void Shuffle(List<GameObject> a)
         {
             // Loop array
             for (int i = a.Count - 1; i > 0; i--)
             {
                 // Randomize a number between 0 and i (so that the range decreases each time)
                 int rnd = UnityEngine.Random.Range(0, i);
     
                 // Save the value of the current i, otherwise it'll overwrite when we swap the values
                 GameObject temp = a[i];
     
                 // Swap the new and old values
                 a[i] = a[rnd];
                 a[rnd] = temp;
             }
     
             // Print
             for (int i = 0; i < a.Count; i++)
             {
                 Debug.Log(a[i]);
             }
         }