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When you're happy with your control, you can add it to the Toolbox by dragging the user control's source code file, in this case UserControl1cs, from the Solution Explorer to the Toolbox When it's there, you can drag and drop it onto the forms of your choice, setting properties and handling events via the Property Browser just as with any of the built-in controlsFigure 113 shows the user control from Figure 112 hosted on a form

If you want to view additional information for the lter, select Add/Remove Columns from the View menu, and additional columns can be added, such as the driver name, whether the printer is shared, and its share name, location, and comments Additional lters can be added by right-clicking on Custom Filters and selecting Add New Printer Filter, which opens up the New Printer Filter Wizard The rst screen asks for a name for the lter and a comment Notice that you also have the option to show the number of items that match the lter (see Figure 5-80)

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FIGURE 5-80 The name and description of the new lter The next screen is the real power of the print lter, and it allows up to six elds to be tested for possible values, as shown in Figure 5-81 The conditions vary depending on the eld As with the condition, if the eld is a de ned type, the values possible are constrained In Figure 5-81, you check the Queue Status eld for exactly being of ine and the Location eld for containing B (for your Lab B) After the conditions are selected, click Next

def selfvoted_down_for_user_id(user_id, page, per_page = 25) entry_ids_for_user(user_id, "down", page, per_page) end def selfvoted_up_for_user_id(user_id, page, per_page = 25) entry_ids_for_user(user_id, "up", page, per_page) end def selfentry_ids_for_user(user_id, value, page, per_page) votes = paginate_by_user_id_and_value( user_id, value, :page => page, :per_page => per_page) votesmap {|vote| voteentry_id} end end

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User controls aren't the only kind of custom controls If you're interested in drawing the contents of your controls yourself, scrolling your controls, or getting more details about user controls, you'll want to read 8: Controls [ Team LiB ]

FIGURE 5-81 A range of possible attributes to examine The nal screen allows a noti cation to be con gured When a printer meets the criteria in the lter, you can send an e-mail with a certain message and/or run a script This is optional but is useful if you created a lter for errors and so forth In the event that a printer goes into an error condition, you could be mailed an alert of the error status Enter the e-mail address that receives the e-mail and an address from which the alert appears to come (see Figure 5-82) Click Finish after con guring the noti cation options or just leave them unselected The custom lter now lists a new entry that you ve created with any of ine printers in Lab B You can always change a lter by right-clicking it and selecting Properties

Noti cations are possible when a printer meets the criteria con gured in a lter You can also add a noti cation for a print server If you right-click a print server, select Set Noti cations from the context menu This allows an e-mail noti cation or script to be executed in the event of a print server failure with the same options as a lter noti cation If a print server goes of ine, restart the print spooler from a script (net stop spooler, then net start spooler)

The nal piece in this printing puzzle is Web-based printing This allows users to view and install printers via an Internet Information Services hosted Web page The good news is that it s done automatically if you selected the Internet Printing sub-role of Print Services, which takes care of Internet Information Services installation and con guration Go to http://<print server>/printers to see a Web page like that shown in Figure 5-83, listing the printers on the server

5

[ Team LiB ]

FIGURE 5-83 Web-based printing access A user can click a printer to see the queue of the printer and depending on the user permissions, he has options to pause, resume, and cancel documents The Connect option is displayed as shown in Figure 5-84 When you connect to a printer, the connection rst tries via remote procedure call as normal If this connection is not possible, the Internet Printing Protocol (IPP) is used Communication for printing is via IPP encapsulated in HTTP packets over standard port 80, which is open in most environments This is all done automatically

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