Public Overridable Property UserData As Object

Dim instance As AnnObject
Dim value As Object
 
instance.UserData = value
 
value = instance.UserData

public virtual object UserData {get; set;}

public:
virtual property Object^ UserData {
   Object^ get();
   void set (    Object^ value);
}

' This is the main method in your application to create a container
Private Function AnnObject_UserData() As AnnContainer
   ' create the container and subclass to its Objects.ItemAdded event
   Dim container As AnnContainer = New AnnContainer()
   AddHandler container.Objects.ItemAdded, AddressOf Objects_ItemAdded

   ' Add an item to the container
   Dim ellipse As AnnEllipseObject = New AnnEllipseObject()
   ellipse.Bounds = New AnnRectangle(100, 100, 100, 100, AnnUnit.Pixel)
   ellipse.Pen = New AnnPen(Color.Green, New AnnLength(2, AnnUnit.Pixel))
   ellipse.Brush = New AnnSolidBrush(Color.Yellow)
   ellipse.Name = "Ellipse"
   container.Objects.Add(ellipse)


   Return container
End Function

' A private class in your application to store the user name as well as the date/time an annotation object was created.
Public Class MyUserData
   Public Sub New(ByVal userName_Renamed As String)
      _userName = userName_Renamed
      _dateCreated = DateTime.Now
   End Sub

   Private _userName As String
   Public Property UserName() As String
      Get
         Return _userName
      End Get
      Set(ByVal value As String)
         _userName = Value
      End Set
   End Property

   Private _dateCreated As DateTime
   Public Property DateCreated() As DateTime
      Get
         Return _dateCreated
      End Get
      Set(ByVal value As DateTime)
         _dateCreated = Value
      End Set
   End Property
End Class

Private Sub Objects_ItemAdded(ByVal sender As Object, ByVal e As RasterCollectionEventArgs(Of AnnObject))
   ' get the object
   Dim obj As AnnObject = CType(IIf(TypeOf e.Item Is AnnObject, e.Item, Nothing), AnnObject)

   ' store the current user name and date/time this object was created in the object
   Dim userData As MyUserData = New MyUserData("MyUserName")
   obj.UserData = userData
End Sub

// This is the main method in your application to create a container
private AnnContainer AnnObject_UserData()
{
   // create the container and subclass to its Objects.ItemAdded event
   AnnContainer container = new AnnContainer();
   container.Objects.ItemAdded += new EventHandler<RasterCollectionEventArgs<AnnObject>>(Objects_ItemAdded);

   // Add an item to the container
   AnnEllipseObject ellipse = new AnnEllipseObject();
   ellipse.Bounds = new AnnRectangle(100, 100, 100, 100, AnnUnit.Pixel);
   ellipse.Pen = new AnnPen(Color.Green, new AnnLength(2, AnnUnit.Pixel));
   ellipse.Brush = new AnnSolidBrush(Color.Yellow);
   ellipse.Name = "Ellipse";
   container.Objects.Add(ellipse);


   return container;
}

// A private class in your application to store the user name as well as the date/time an annotation object was created.
public class MyUserData
{
   public MyUserData(string userName)
   {
      _userName = userName;
      _dateCreated = DateTime.Now;
   }

   private string _userName;
   public string UserName
   {
      get
      {
         return _userName;
      }
      set
      {
         _userName = value;
      }
   }

   private DateTime _dateCreated;
   public DateTime DateCreated
   {
      get
      {
         return _dateCreated;
      }
      set
      {
         _dateCreated = value;
      }
   }
}

void Objects_ItemAdded(object sender, RasterCollectionEventArgs<AnnObject> e)
{
   // get the object
   AnnObject obj = e.Item as AnnObject;

   // store the current user name and date/time this object was created in the object
   MyUserData userData = new MyUserData("MyUserName");
   obj.UserData = userData;
}