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this folder as a target If a share already exists for the folder, then no action is required Otherwise, the wizard prompts you to create a new share Finally, a summary is displayed, and the new server is added to the replica group If this were part of a namespace folder target, the DFSN has also been updated with a new folder target The whole process is totally integrated and works the opposite way if you added a new folder target in the namespace: You are prompted to also update the replica group by selecting a server with which to replicate with or use a custom set of connections To force replication, run the dfsrdiag pollad command on the server that is replicating to the new member rst, so that it knows about its new replication partner, and then run the dfsrdiag pollad command on the new replication group server If you run the AD poll only on the new server, you are likely to get an error in the event log, informing you that the replication partner politely told your new server to go away because it knows nothing about the new replica group This situation is exempli ed in the following example:

Log Name: DFS Replication Source: DFSR Date: 12/1/2007 6:02:12 AM Event ID: 5012 Task Category: None Level: Error Keywords: Classic User: N/A Computer: SAVDALSRV03savilltechnet Description: The DFS Replication service failed to communicate with partner SAVDALSRV02 for replication group savilltechnet\shared\documents The partner did not recognize the connection or the replication group con guration Partner DNS Address: savdalsrv02savilltechnet Optional data if available: Partner WINS Address: savdalsrv02 Partner IP Address: 192168140

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It helps to think up front about how your clients will handle error conditions Some error conditions can be anticipated and programmed against, while others need to be caught and logged for later inspection Identifying what you want to do for each error condition can be tricky Let s go through some of the errors you might encounter One of the basic error conditions you expect is a general data error These are the 400 errors that your services are throwing to indicate data validation problems In this case, you can handle the error and bubble it up to the user like a standard ActiveRecord data validation The other errors are unexpected ones For some of these, you can log them and continue execution without the response Consider the previous example involving building a user s reading list You made three calls to build the list: first to get the entry IDs, second to get the ratings for these entries, and third to get the entries themselves If the request to get the entry ratings failed, it s still conceivable that you could render the page without ratings It s not ideal, but it s better than throwing an error to the user Finally, there are conditions that are considered unrecoverable These errors prevent you from continuing When you face such an error, you might want to retry the

To handle the drawing for a ListBox, you first set the DrawMode property to something other than Normal (the default), and then you handle the ListBox control's DrawItem event: void InitializeComponent() { thislistBox1DrawMode = DrawModeOwnerDrawFixed; } void listBox1_DrawItem(object sender, DrawItemEventArgs e) { // Draw the background eDrawBackground(); // Get the default font Font drawFont = eFont; bool ourFont = false; // Draw in italics if selected if( (eState & DrawItemStateSelected) == DrawItemStateSelected ) { ourFont = true; drawFont = new Font(drawFont, FontStyleItalic); } using( Brush brush = new SolidBrush(eForeColor) ) { // Draw the list box item eGraphicsDrawString(listBox1Items[eIndex]ToString(), drawFont, new SolidBrush(eForeColor), eBounds); if( ourFont ) drawFontDispose(); } // Draw the focus rectangle eDrawFocusRectangle(); } The DrawItem method comes with the DrawItemEventArgs object: class DrawItemEventArgs : EventArgs { // Properties public Color BackColor { get; } public Rectangle Bounds { get; } public Font Font { get; } public Color ForeColor { get; } public Graphics Graphics { get; } public int Index { get; } public DrawItemState State { get; } // Methods public virtual void DrawBackground(); public virtual void DrawFocusRectangle(); }

The service will retry the connection periodically Additional Information: Error: 9026 (The connection is invalid)

Connection ID: 976967B2-DC83-4838-BDEE-D39E734E594A Replication Group ID: 4D33543B-3BFC-4435-95A3-983DE4AA7C31

Let s remove a member from the replica set and remove the SAVDALSRV02 server It is in a unique position because right now it s the only server replicating to SAVDALSRV03 That is what you con gured during the addition of SRV03, as shown in the replication summary in Figure 15-30 When you remove SAVDALSRV02, the SRV03 server no longer has any replication partners, so the integrity of the replication is lost

FIGURE 15-30 Replication connections To remove a member from the replica group, right-click the member and select Delete Member If the replica group is part of a DFSN, a dialog appears, asking if the server should be removed from the replica group or the replica group and the namespace (see Figure 15-31) If the replica group is part of a namespace, then remove it from the namespace because the content on the target is no longer synchronized, causing end-user consistency issues

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