Public Function Add ( _
    key As String, _
    value As Object _
) As StateItem

Dim instance As StateBag
Dim key As String
Dim value As Object
Dim returnValue As StateItem

returnValue = instance.Add(key, value)

public StateItem Add (
    string key,
    Object value
)

public:
StateItem^ Add (
    String^ key, 
    Object^ value
)

public StateItem Add (
    String key, 
    Object value
)

public function Add (
    key : String, 
    value : Object
) : StateItem

Sub MovePiece(fromPosition As String, toPosition As String)
   Dim bag As StateBag = ViewState
   Dim piece As Object = bag(fromPosition)
   If Not (piece Is Nothing) Then
      bag.Remove(fromPosition)
      bag.Add(toPosition, piece)
      RenderBoard()
   Else
      Throw New InvalidPositionException("There is no game piece at the ""from"" position.")
   End If
End Sub 'MovePiece

void MovePiece(string fromPosition, string toPosition) {
   StateBag bag = ViewState;
   object piece = bag[fromPosition];
   if (piece != null) {
      bag.Remove(fromPosition);
      bag.Add(toPosition, piece);
      RenderBoard();
   }
   else {
      throw new InvalidPositionException("There is no game piece at the \"from\" position."); 
   }
}

function MovePiece(fromPosition : String, toPosition : String) {
   var bag : StateBag = ViewState;
   var piece = bag[fromPosition];
   if (piece != null) {
      bag.Remove(fromPosition);
      bag.Add(toPosition, piece);
      RenderBoard();
   }
   else {
      throw new InvalidPositionException("There is no game piece at the \"from\" position."); 
   }
}