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Once the SqlCommand object has been created correctly, you can use the ExecuteReader() method to return the results that you want to display as a SqlDataReader object. You can use this object directly as a data source for the GridView, so you pass it directly into the DataSource property: // show the data GridView1.DataSource = myCommand.ExecuteReader(); GridView1.DataBind(); We ll take a much more detailed look at the SqlDataReader object in 5. For now, it s enough to know that it returns a read-only, forward-only view of the results of the query. Once the DataSource for the GridView is set, you call the DataBind() method to actually populate the GridView with the results. Without this call, no results will be shown, as the automatic data binding that you saw when using the SqlDataSource doesn t apply when you set the DataSource manually. We ll look at data binding in great detail in s 6 and 7. For now, you can just rely on the fact that it works.

Perforce is a commercial version control system sold by Perforce Software Inc (http://www perforcecom/) First, we ll cover the similarities between Subversion and Perforce Both systems are designed around a central server process with users accessing the repository (or depot in Perforce terminology) via a client application over the network Both use cheap copies as their means of providing branch support, with branches existing in the same namespace as regular files Perforce is based on a single central server and maintains a great deal of information about client views (which are sort of analogous to the Subversion working copy) on the server This speeds up some operations but tethers the client to the server Without network support, Perforce is largely crippled Perforce s workflow is both similar to and different from Subversion s.

You are also welcome to make and distribute your own IME. Perhaps you want to create a Dvorak soft keyboard, a keyboard for another language, or one that echoes pressed keys verbally. An IME is packaged in the form of a service, an Android component described in s 29 and 30. If you are interested in creating such an editor, you should take a look at the SoftKeyboard sample application distributed with the Android 1.5 SDK and, of course, the Android source code (search for the LatinIME class).

So far in this chapter, you ve looked at the basics of connecting to a data source, executing a query, and returning the results to the page. However, you ve hard-coded the query that you want to execute, so it s not very dynamic. You can show the Players for all of the Manufacturers, but you don t have any way to filter those results to show only the Players for a single Manufacturer. You can filter the results of a query by using a WHERE clause to constrain the records that are returned. You can do this in two ways: By modifying the query that you re executing at runtime and specifying the variables within the WHERE clause directly By placing parameters within the WHERE clause of the query at design time and changing the values of these parameters at runtime You ll look at each of these methods in turn.

There s support for locking of files, but most work is done in a nonlocking manner with merging of nonconflicting changes into the client view when the user runs p4 sync The primary difference stems from the fact that so much data is kept on the server side When you want to make a change to a file, you need to inform the server first by running p4 edit To enforce this behavior, files in the client view start out as read-only and are made writable only after you explicitly tell the server you want to edit them This is a significant departure from the Subversion model, in which you can edit any file in your working copy at any time without involving the server at all Perforce doesn t support tracking file history across copies or renames, although you can simulate it via use of the p4 integrate command.