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CHAPTER 5 DATA BINDING
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Notice that we re using the abbreviated syntax for padding, which contains the values for all four sides in a single value.
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There s a lot more to CSS than what we ll be using. You can learn more about it in Cascading Style Tip Sheets, by Owen Briggs, et al (Apress, 2004; ISBN: 1-59059-231-X) and the W3C CSS specifications (http://www.w3.org/Style/CSS/).
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3. Add an HTML table with six rows and two columns. Set the following properties for it: (id): tbLogin class: TableLines border: 0 cellpadding: 2 cellspacing: 2 width: blank (remove the default value) 4. Add Label web server controls to the cells on the right, except for the last row, which will contain a Hyperlink control, with an ID of lnkEmail. Below the table, add some text and a label to reflect the form layout, as shown here.
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5. Below the text, add a web server Button control. Set its ID to btnAuthorize, its CssClass to Button, and its Text property to Authorize Contact. 6. Switch to the HTML view, and make the following changes to add data binding expressions to the controls: ... <body ms_positioning="FlowLayout"> <form id="Form1" method="post" runat="server"> <p>
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<table class="TableLines" id="tbLogin" cellspacing="2" cellpadding="2" width="300" border="0"> <tr> <td>Name</td> <td> <asp:label id="lblName" runat="server" text='<%# dsUser.Tables(0).Rows(0)("FirstName") + " " + _ dsUser.Tables(0).Rows(0)("LastName") %>'> </asp:label></td> </tr> <tr> <td>Birth Date:</td> <td> <asp:label id="lblBirth" runat="server" text='<%# DataBinder.Eval( _ dsUser.Tables(0).Rows(0), _ "(DateOfBirth)", "{0:MMMM dd, yyyy}") %>'> </asp:label></td> </tr> <tr> <td>Phone Number:</td> <td> <asp:label id="lblPhone" runat="server" text='<%# DataBinder.Eval( _ dsUser.Tables("User").Rows(0), _ "(PhoneNumber)") %>'> </asp:label></td> </tr> <tr> <td>Mobile Number:</td> <td> <asp:label id="lblMobile" runat="server" text='<%# dsUser.Tables("User").Rows(0)("CellNumber") %>'> </asp:label></td> </tr> <tr> <td>Address:</td> <td> <asp:label id="lblAddress" runat="server" text='<%# DataBinder.Eval( _ dsUser.Tables("User").Rows(0), _ "(Address)") %>'> </asp:label></td> </tr> <tr> <td>E-mail:</td>
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CHAPTER 5 DATA BINDING
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<td> <asp:hyperlink id="lnkEmail" runat="server" navigateurl='<%# DataBinder.Eval( _ dsUser.Tables("User").Rows(0), _ "(Email)", "mailto:{0}") %>'> Send mail </asp:hyperlink></td> </tr> </table> </p> <p>You have <asp:label id="lblPending" runat="server" text="<%# GetPending() %>"> </asp:label> pending requests for contact.</p> <p> <asp:button id="btnAuthorize" runat="server" text="Authorize Contact" cssclass="Button"> </asp:button> </p> </form> </body> 7. Open the code-behind page and add the following Imports statements to the top of the page: Imports System.Configuration Imports System.Data.SqlClient 8. Also add the DataSet as a protected variable, and perform the database access in the Page_Load() event handler: ... protected dsUser as DataSet Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load Dim userID As String = Request.QueryString("RequestID") ' Ensure we received an ID If userID Is Nothing Then Throw New ArgumentException( _ "This page expects a RequestID parameter.") End If ' Create the connection and data adapter Dim cnFriends As New SqlConnection( _ ConfigurationSettings.AppSettings("cnFriends.ConnectionString")) Dim adUser As New SqlDataAdapter( _ "SELECT * FROM [User] WHERE UserID=@ID", cnFriends)
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CHAPTER 5 DATA BINDING
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adUser.SelectCommand.Parameters.Add("@ID", userID) ' Initialize the dataset and fill it with data dsUser = New DataSet adUser.Fill(dsUser, "User") ' Finally, bind all the controls on the page Me.DataBind() End Sub 9. The next method, GetPending(), will return the value that s used in the lblPending label to show the number of pending requests for the current user: Protected Function GetPending() As String ' Create the connection and command to execute Dim cnFriends As SqlConnection = New SqlConnection ( _ ConfigurationSettings.AppSettings("cnFriends.ConnectionString")) Dim cmd As SqlCommand = New SqlCommand ( _ "SELECT COUNT(*) FROM Contact " _ "WHERE IsApproved=0 AND DestinationID=@ID", cnFriends) cmd.Parameters.Add("@ID", Page.User.Identity.Name) cnFriends.Open() Try Return cmd.ExecuteScalar().ToString() Finally cnFriends.Close() End Try End Function 10. The last piece of code that you need to add here is the handler for the Authorize button. This will just perform an update of the IsApproved flag. Double-click the button and add the following code to the event handler: Private Sub btnAuthorize_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles btnAuthorize.Click ' Create the connection and command to execute Dim cnFriends As New SqlConnection( _ ConfigurationSettings.AppSettings("cnFriends.ConnectionString")) Dim cmd As New SqlCommand( _ "UPDATE Contact SET IsApproved=1 " + _ " WHERE RequestID=@RequestID AND DestinationID=@DestinationID", _ cnFriends) cmd.Parameters.Add("@RequestID", Request.QueryString("RequestID")) cmd.Parameters.Add("@DestinationID", Page.User.Identity.Name) cnFriends.Open() Try cmd.ExecuteNonQuery()
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