C# - Param Arrays

At times, while declaring a method, you are not sure of the number of arguments passed as a parameter. C# param arrays (or parameter arrays) come into help at such times.

The following example demonstrates this −

using System;

namespace ArrayApplication {
   class ParamArray {
      public int AddElements(params int[] arr) {
         int sum = 0;
         foreach (int i in arr) {
            sum += i;
         return sum;
   class TestClass {
      static void Main(string[] args) {
         ParamArray app = new ParamArray();
         int sum = app.AddElements(512, 720, 250, 567, 889);
         Console.WriteLine("The sum is: {0}", sum);

When the above code is compiled and executed, it produces the following result −

The sum is: 2938
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