A tuple is a finite ordered list of elements. In C#, it's not a new thing, having been available since .NET Framework 4.0. It is useful when you want to return multiple values from a method without creating a separate class or collection to hold the data. Tuples are declared in the manner, Tuple<T1, T2, T3, ...> and are available under the System namespace.
By default, a tuple can hold up to eight value types, but you can extend it by adding the reference of System.Runtime.
Although this is useful when returning multiple values, you need to create an allocation for the System.Tuple<...> object. The following example demonstrates how to return multiple values using a tuple:
public static Tuple<string, string> GetAuthor()
{
return new Tuple<string, string>("Kunal Chowdhury",
...