Why do we use the params keyword in C#?

While declaring a method, if you are not sure of the number of arguments passed as a parameter, then use the C# param arrays.

The following is the complete example to learn how to implement param in C# −


using System;

namespace Program {
   class ParamArray {
      public int AddElements(params int[] arr) {
         int sum = 0;
         foreach (int i in arr) {
            sum += i;
         return sum;

   class Demo {
      static void Main(string[] args) {
         ParamArray app = new ParamArray();
         int sum = app.AddElements(300, 250, 350, 600, 120);
         Console.WriteLine("The sum is: {0}", sum);

Updated on: 21-Jun-2020


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