Create Spatial Bookmark for ActiveView Extent Snippet

///<summary>Using the IActiveView's current extent create a spatial bookmark.</summary>
/// 
///<param name="activeView">An IActiveView interface</param>
///<param name="bookmarkName">A System.String that is the name of what you want to call the bookmark. Example: "USA"</param>
///  
///<remarks></remarks>
public void CreateSpatialBookmarkForActiveViewExtent(ESRI.ArcGIS.Carto.IActiveView activeView, System.String bookmarkName)
{
  if(activeView == null || bookmarkName == null)
  {
    return;
  }
  // Create a new bookmark and set it's location to the focus map's current extent
  ESRI.ArcGIS.Carto.IAOIBookmark aoiBookmark = new ESRI.ArcGIS.Carto.AOIBookmarkClass();

  // Bookmark set for the current extent
  aoiBookmark.Location = activeView.Extent;
  aoiBookmark.Name = bookmarkName;

  // Add the bookmark to the map's bookmark collection  
  // For ArcGIS Desktop this will add the bookmark to the View | Bookmarks menu 
  ESRI.ArcGIS.Carto.IMapBookmarks mapBookmarks = activeView as ESRI.ArcGIS.Carto.IMapBookmarks; // Dynamic Cast
  mapBookmarks.AddBookmark(aoiBookmark);
}

'''<summary>Using the IActiveView's current extent create a spatial bookmark.</summary>
''' 
'''<param name="activeView">An IActiveView interface</param>
'''<param name="bookmarkName">A System.String that is the name of what you want to call the bookmark. Example: "USA"</param>
'''  
'''<remarks></remarks>
Public Sub CreateSpatialBookmarkForActiveViewExtent(ByVal activeView As ESRI.ArcGIS.Carto.IActiveView, ByVal bookmarkName As System.String)

  If activeView Is Nothing OrElse bookmarkName Is Nothing Then
  	Return
  End If

  ' Create a new bookmark and set it's location to the focus map's current extent
  Dim aoiBookmark As ESRI.ArcGIS.Carto.IAOIBookmark = New ESRI.ArcGIS.Carto.AOIBookmarkClass

  ' Bookmark set for the current extent
  aoiBookmark.Location = activeView.Extent
  aoiBookmark.Name = bookmarkName

  ' Add the bookmark to the map's bookmark collection  
  ' For ArcGIS Desktop this will add the bookmark to the View | Bookmarks menu 
  Dim mapBookmarks As ESRI.ArcGIS.Carto.IMapBookmarks = TryCast(activeView, ESRI.ArcGIS.Carto.IMapBookmarks) ' Dynamic Cast
  mapBookmarks.AddBookmark(aoiBookmark)

End Sub