C# Error CS8210 – A tuple may not contain a value of type ‘void’.

C# Error

CS8210 – A tuple may not contain a value of type ‘void’.

Reason for the Error & Solution

A tuple may not contain a value of type ‘void’.

Example

The following sample generates CS8210:

// CS8210.cs
void Method()
{
}

void Test()
{
    var x = ("something", Method());
}

Your method returns void, so that method doesn’t return a value. You can’t use a method that returns void for a data member of a tuple.