Check out example codes for "c# randomize a list". It will help you in understanding the concepts better.

Code Example 1

var shuffledcards = cards.OrderBy(a => Guid.NewGuid()).ToList();

Code Example 2

private static Random rng = new Random();  

public static void Shuffle<T>(this IList<T> list)  
{  
    int n = list.Count;  
    while (n > 1) {  
        n--;  
        int k = rng.Next(n + 1);  
        T value = list[k];  
        list[k] = list[n];  
        list[n] = value;  
    }  
}

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