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# −

Example

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);
         Console.ReadKey();
      }
   }
}