C# Error Compiler error CS0702 – Constraint cannot be special class ‘{0}’

C# Error

CS0702 – Constraint cannot be special class ‘{0}’

Reason for the Error & Solution

Constraint cannot be special class ‘identifier’

The following types may not be used as constraints: , , or .

Example

The following sample generates CS0702:

// CS0702.cs
class C<T> where T : System.Array  // CS0702
{
}