C# tuple is a data structure Which contains a sequence of elements of different data types. Tuples were available before C# 7.0, but they were unproductive and had no language support. C# 7.0 introduces better tuples feature that enables semantic names for the fields of a tuple using new, more efficient tuple types. C# 7 introduced ValueTuple to reduce the limitations of Tuple and it is more easier to work with Tuple. 

Syntax

Tuple<T1, T2, T3, T4, T5, T6, T7, TRest>

an example below creates a tuple with four elements:

Tuple<int, string, string, string > Customer = new Tuple <int, string, string, string >(1, "Shyam", "Nepal","Kathmandu");

We can use Tuples in the following Cases:

1. If we want to return multiple values, from one method without using out or ref parameters.
2. If we want to pass multiple values to one method through a single parameter.
3. When we want to hold a database record or some values temporarily without creating a separate class.

Implementation:

using System;
namespace CSharpTupule
{
    class Program
    {
        static void Main(string[] args)
        {
            var Result = Calculate(12, 8);
            Console.WriteLine("Sum: " + Result.Item1);
            Console.WriteLine("Multiply: " + Result.Item2);
            Console.WriteLine("Subtraction: " + Result.Item3);
            Console.WriteLine("Divide: " + Result.Item4);
            Console.ReadLine();
        }
        public static Tuple<int, int, int, int> Calculate(int x, int y)
        {
            int Add = x + y;
            int Mul = x * y;
            int Sub = x - y;
            int Div = x / y;
            Tuple<int, int, int, int> t = Tuple.Create(Add, Mul, Sub, Div);
            return t;
        }
    }
}

Output: