# Given these three similar methods, how we can condense them into a single method?

• A+
Category：Languages
``public int Add2(int a, int b) => a + b; public int Add3(int a, int b, int c) => a + b + c; public int Add4 (int a,int b,int c,int d) => a + b + c + d; ``

How can we write these methods under a single method?

Use `params int[]` in your Add method and you can add as many numbers as you'd like.

Something like:

``using System;  public class Program {     public static void Main()     {         Console.WriteLine(Add(1, 2, 3, 4, 5));           }      public static int Add(params int[] numbers)      {         int sum = 0;         foreach (int n in numbers)         {             sum += n;         }          return sum;     } } ``

Result:

``15 ``

Fiddle Demo

## Enhancement

With `Linq`, the code get's shorter

``using System; using System.Linq;  public class Program {     public static void Main()     {         Console.WriteLine(Add(1, 2, 3, 4, 5));           }      public static int Add(params int[] numbers)      {         return numbers.Sum();     } } ``

Result:

``15 ``

Fiddle Demo