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The GridView is a large control with a wealth of functionality, and in the previous section, you barely scratched the surface of what you can do with it. If you just want to return a list of data and codelessly control how that list appears, you can achieve this with the DataList control. This control is a server control, found on the Data tab of your Toolbox. E (-E) switch, SQLCmd tool, 62 Edit menu, 22 EditorZone component, 191 EM see Express Manager (EM) tool EmailWebSite building first web application, 10 enabled attribute profile element, 203 enablePasswordReset attribute, 248 enablePasswordRetrieval attribute, 248 encapsulation, OOP, 7 End User License Agreement installing VWD, 3 en-gb language, 170 entities, 51 en-us language, 170 Environment node environment options, VWD, 42 Error List window, 35 Eval method data binding controls, 131 events SiteMapResolve event, 163 execution advantages of stored procedures, 74 explicit localization, websites, 175 explicit localization for a control, 178 180 Express Manager (EM) tool, 48, 56 installing, 56 61 toolbar buttons, 59 private void btnUpDir_Click(object sender, RoutedEventArgs e) { if (currentDir != "") { currentDir = System.IO.Path.GetDirectoryName(currentDir); } GetStorageData(); } 12. When the user clicks the Open Directory button, you will combine the current directory with the selected directory from the directory ListBox using the System.IO.Path.Combine() method, set the current directory to that new directory, and once again reexecute the GetStorageData() method. private void btnOpenDir_Click(object sender, RoutedEventArgs e) { if (this.lstDirectoryListing.SelectedItem != null) { currentDir = System.IO.Path.Combine( currentDir, this.lstDirectoryListing.SelectedItem.ToString()); } GetStorageData(); } 13. Next, implement the Show File button s Click event, as follows: private void btnOpenFile_Click(object sender, RoutedEventArgs e) { if (this.lstFileListing.SelectedItem != null) { this.txtFileName.Text = this.lstFileListing.SelectedItem.ToString(); using (var store = IsolatedStorageFile.GetUserStoreForApplication()) { string filePath = System.IO.Path.Combine( currentDir, this.lstFileListing.SelectedItem.ToString()); IsolatedStorageFileStream stream = store.OpenFile(filePath, FileMode.Open); StreamReader sr = new StreamReader(stream); You add an INSERT statement and change the name of the original query string variable from sql to ins in order to clearly distinguish it from this statement: 'SQL to insert employees Dim ins As String = "insert into employees " & _ "(firstname,lastname,titleofcourtesy,city,country)" & _ "values(@firstname,@lastname,@titleofcourtesy,@city,@country)" You replace the update comment in the try block with quite a bit of code. Let s look at it piece by piece. Creating a command is nothing new, but notice that you use the insert SQL variable (ins), not the query one (sql): ' insert employees ' ' create command Dim cmd As New SqlCommand(ins, conn) Then you configure the command parameters. The five columns for which you ll provide values are each mapped to a named command parameter. You don t supply the primary key value since it s generated by SQL Server, and the other columns are nullable, so you don t have to provide values for them. Note that all the values are current values, so you don t have to specify the SourceVersion property. ' map parameters cmd.Parameters.Add("@firstname", _ SqlDbType.NVarChar, 10, "firstname") cmd.Parameters.Add("@lastname", _ SqlDbType.NVarChar, 20, "lastname") cmd.Parameters.Add("@titleofcourtesy", _ SqlDbType.NVarChar, 25, "titleofcourtesy") cmd.Parameters.Add("@city", _ SqlDbType.NVarChar, 15, "city") cmd.Parameters.Add("@country", _ SqlDbType.NVarChar, 15, "country") Finally, you set the data adapter s InsertCommand property with the command to insert into the Employees table so it will be the SQL the data adapter executes when you call its Update method. You then call Update on the data adapter to propagate the change to the database. Here you add only one row, but since the SQL is parameterized, the data adapter will look for all new rows in the employees data table and submit inserts for all of them to the database: ' insert employees da.InsertCommand = cmd da.Update(ds, "employees") Figure 13-8 shows the new row, and if you check with Database Explorer or SSMSE, you ll see the row has been propagated to the database. Roy Beatty is now in the Employees table.
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