How to sum up an array of integers in C#

Provided that you can use .NET 3.5 (or newer) and LINQ, try

int sum = arr.Sum();

Yes there is. With .NET 3.5:

int sum = arr.Sum();
Console.WriteLine(sum);

If you're not using .NET 3.5 you could do this:

int sum = 0;
Array.ForEach(arr, delegate(int i) { sum += i; });
Console.WriteLine(sum);

With LINQ:

arr.Sum()

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