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bat) to the Debug folder that contains the following instructions (if you have not authored *bat files before, don t concern yourself with the details; this is a test this is only a test): @echo off rem A batch file for SimpleCSharpAppexe rem which captures the app's return value SimpleCSharpApp @if "%ERRORLEVEL%" == "0" goto success :fail echo This application has failed! echo return value = %ERRORLEVEL% goto end.

Again, if you use controls with the appropriate ID values and use the appropriate CommandName values for buttons, you don t have to write any code for the control to work, as in the previous examples where you didn t use templates. In the previous code, these special controls are in bold. Some of these controls are required for the templates, and others are optional. Table 21-12 lists the controls for PasswordRecovery templates. Table 21-12. Special Controls for PasswordRecovery Templates

outside of the table collection maintained by the DataSet. You will deal with both of these shortcomings, beginning by populating the table with data using a DataRow objects.

System.Web.UI.WebControls.Literal System.Web.UI.WebControls.Literal System.Web.UI.WebControls.Literal System.Web.UI.WebControls.TextBox All controls that support event bubbling

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As you have seen, a collection of DataColumn objects represents the schema of a DataTable. In contrast, a collection of DataRow objects represents the actual data in the table. Thus, if you have 20 rows in the Inventory table of the AutoLot database, you can represent these records using 20 DataRow objects. Table 22-4 documents some (but not all) of the members of the DataRow type. Table 22-4. Key Members of the DataRow Type

Again, the submit button can be any control that supports event bubbling and a CommandName property. Typically you can use the controls Button, ImageButton, or LinkButton for this purpose. The CommandName must be set to Submit; otherwise, the command is not recognized by the control (the ID is not evaluated and can therefore be set to any value). The SuccessTemplate doesn t require any type of control with any special IDs. Therefore, you can add any control you want there; it s just for displaying the confirmation. In the previous example, it includes a Literal control that should display the e-mail address to which the password has been sent. You can set this Literal control through the SendingEmail event procedure. Again, you can use the FindControl method for finding the control (which is actually a child control of the password control) in the appropriate template, as follows: Protected Sub PasswordTemplateCtrl_SendingMail(ByVal sender As Object, ByVal e As MailMessageEventArgs) Dim lbl As Label = CType(PasswordTemplateCtrl.SuccessTemplateContainer.FindControl ("EmailLabel"), Label) lbl.Text = e.Message.To(0).Address End Sub Because the control includes more than one template, you cannot call the FindControl method directly on the PasswordRecovery control instance. You have to select the appropriate template container (UserNameTemplateContainer, QuestionTemplateContainer, or SuccessTemplateContainer). Afterward, you can work with the control as usual. In the previous example, you just set the text of the label to the first e-mail recipient. Of course, usually for a password recovery, the list has only one mail recipient.

The HasErrors property returns a Boolean value indicating whether there are errors in a DataRow. If so, you can use the GetColumnsInError() method to obtain the offending columns and GetColumnError()to obtain the error description. Similarly, you can use the ClearErrors() method to remove each error listing for the row. The RowError property allows you to configure a textual description of the error for a given row. This property gets or sets all of the column values for this row using an array of objects. You use this property to pinpoint the current state of the DataRow in the DataTable containing the DataRow, using values of the RowState enumeration (e.g., a row can be flagged as new, modified, unchanged, or deleted). You use this property to obtain a reference to the DataTable containing this DataRow. These methods commit or reject all changes made to this row since the last time AcceptChanges() was called. These methods begin, end, or cancel an edit operation on a DataRow object.

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