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Sample of Visual Basic Code Public Function GetEmployeesByDept(ByVal department As String) _ As List(Of Employee) 'query the XML list by department and return a list of ' Employee(objects) Dim empQuery As IEnumerable(Of Employee) = From emp In _empXml.Descendants("Employee") Where emp.Element("Department").Value = department Select New Employee With { .Id = emp.Element("ID").Value, .Department = emp.Element("Department").Value, .FirstName = emp.Element("FirstName").Value, .LastName = emp.Element("LastName").Value, .Location = emp.Element("Location").Value } Return empQuery.ToList() End Function Sample of C# Code public List<Employee> GetEmployeesByDept(string department) { //query the XML list by department and return a list of Employee objects IEnumerable<Employee> empQuery = from emp in _empXml.Descendants("Employee") where emp.Element("Department").Value == department select new Employee

[CertDetectSubject]

{ Id = emp.Element("ID").Value, Department = emp.Element("Department").Value, FirstName = emp.Element("FirstName").Value, LastName = emp.Element("LastName").Value, Location = emp.Element("Location").Value }; return empQuery.ToList(); }

9. 10.

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Figure 5-9 : The result when the first validator on a given field is set to Static display The ErrorMessage associated with the first validator (which hasn t been fired) is Out of Range . Looking at Figure 5-9, you can see that the space between the text box and the beginning of the first Must enter a value string is about what might be required to fit Out of Range . Because we have the actual source that generated this page, we can see what the browser uses to render the page. The following HTML code is the table row returned to the browser in which the range validator is located. (The code has been reformatted for readability.) <tr> <td> Range Validation (1-12): </td> <td> <input name="Range" id="Range" type="text" size="10" /> </td> <td> <span id="ValRange" controltovalidate="Range" errormessage="Out of Range" type="Integer" evaluationfunction="RangeValidatorEvaluateIsValid" maximumvalue="12" minimumvalue="1" style="color:Red;visibility:hidden;"> Out of Range </span>

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Open the Default.aspx page. Add a DropDownList, Button, GridView, and ObjectDataSource control to the page. Configure the ObjectDataSource to point to the EmployeeServices.GetDepartments method. (See 12, Working with Data Source Controls and Data-Bound Controls for more information on ObjectDataSource.) Configure the DropDownList to use the ObjectDataSource. Your markup inside the MainContent placeholder should look similar to the following.

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent"> <h2>View Employees by Department</h2> Select a Department<br /> <asp:DropDownList ID="DropDownListDepts" runat="server" DataSourceID="ObjectDataSourceDepts"> </asp:DropDownList> <asp:Button ID="ButtonUpdate" runat="server" Text="Update" onclick="ButtonUpdate_Click" /> <hr /> <asp:GridView ID="GridViewEmployees" runat="server" CellPadding="4" ForeColor="#333333" GridLines="None"> <AlternatingRowStyle BackColor="White" ForeColor="#284775" /> <EditRowStyle BackColor="#999999" /> <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" /> <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" /> <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" /> <RowStyle BackColor="#F7F6F3" ForeColor="#333333" /> </asp:GridView> <asp:ObjectDataSource ID="ObjectDataSourceDepts" runat="server" SelectMethod="GetDepartments" TypeName="EmployeeServices"></asp:ObjectDataSource> </asp:Content>

Add a click event to the Button control. Inside the code for the click event, call the EmployeeServices.GetEmployeesByDept method and pass the selected method from the DropDownList. Update the data in the GridView control with the results. This code should look similar to the following.

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Sample of Visual Basic Code Protected Sub ButtonUpdate_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles ButtonUpdate.Click Dim empSrv As EmployeeServices = New EmployeeServices() GridViewEmployees.DataSource = empSrv.GetEmployeesByDept(DropDownListDepts.SelectedItem.Text) GridViewEmployees.DataBind() End Sub Sample of C# Code protected void ButtonUpdate_Click(object sender, EventArgs e) { EmployeeServices empSrv = new EmployeeServices(); GridViewEmployees.DataSource = empSrv.GetEmployeesByDept(DropDownListDepts.SelectedItem.Text); GridViewEmployees.DataBind(); }

<span id="_ctl1" controltovalidate="Range" errormessage="Must enter a value." display="Dynamic" evaluationfunction="RequiredFieldValidatorEvaluateIsValid" initialvalue="" style="color:Red;display:none;"> Must enter a value. </span> </td> </tr> From this HTML output, you can verify that the space for the Out of Range text is present in the rendered HTML. Thus, in general, when two validators are present, you ll want to set Display to Dynamic. The ValidationSummary Control Sometimes, you might want to simply summarize the errors on a page, perhaps because the errors might involve multiple fields, and so signaling an error on a single field might be misleading. For example, if we were to use a CompareValidator control to compare two new password entries, placing an error message next to one or the other of the fields could be misleading. On the other hand, it could just be a part of the user interface standards at your organization that you display a single error message, either at the top or the bottom of the page. How do you do that with ASP.NET ASP.NET offers another kind of validation control, ValidationSummary. This control handles all the error messages from all validators and displays them in a single place. Listing 5-6 demonstrates how this control is used in ValidatorTestSummary.aspx. Listing 5-6 ValidatorTestSummary.aspx, showing how the ValidationSummary control is used

Run your application. Select a department and click the Update button. Your results should look similar to those in Figure 11-1.

3. Save the file as cmconfig.txt in the My Documents folder, and close Notepad. There is a copy of this file in the 7 folder on the companion CD.