C# nullable string error

Question

private string? typeOfContract
{
  get { return (string?)ViewState[\"typeOfContract\"]; }
  set { ViewState[\"typeOfContract\"] = value; }
}

Later

Answer 1

For nullable, use ? with all of the C# primitives, except for string.

The following page gives a list of the C# primitives: http://msdn.microsoft.com/en-us/library/aa711900(v=vs.71).aspx