Generic interface code in c#

Here We can define interfaces for generic collection classes as well as for the generic classes which represents the collection items. This is very helpful in C# programming to use the generic interfaces such as IComparable<T> rather than IComparable to avoid boxing and unboxing operations on value types.

class Program
    {
        
        static void Main()
        {
            char[] vowels = new char[5];

            vowels[0] = 'a';
            vowels[1] = 'e';
            vowels[2] = 'i';
            vowels[3] = 'o';
            vowels[4] = 'u';
            Show(vowels);                        
            List<char> cons = new List<char>();   
            cons.Add('b');
            cons.Add('c');
            cons.Add('d');
            Show(cons);                           
        }

        static void Show(IList<char> li)          
        {
            Console.WriteLine("Total: {0}", li.Count);
            foreach (char c in li)
            {
                Console.WriteLine(c);
            }
        }
    }