StateBag.Add(String, Object) Method

Reference

Definition

Namespace:: System.Web.UI

Assembly:: System.Web.dll

Important

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Adds a new StateItem object to the StateBag object. If the item already exists in the StateBag object, this method updates the value of the item.

public:
 System::Web::UI::StateItem ^ Add(System::String ^ key, System::Object ^ value);

public System.Web.UI.StateItem Add (string key, object value);

member this.Add : string * obj -> System.Web.UI.StateItem

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

Parameters

key: String

The attribute name for the StateItem.

value: Object

The value of the item to add to the StateBag.

Returns

StateItem

Returns a StateItem that represents the object added to view state.

Exceptions

ArgumentException

key is null.

-or-

The number of characters in key is 0.

Examples

The following code example demonstrates using the Add method.

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."); 
   }
}

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

Applies to