Figure 12.10 The default error ASP.NET error page. in .NET

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Figure 12.10 The default error ASP.NET error page.
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Figure 12.11 The custom Web page for a File Not Found (404) error.
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ASP.NET requires a page to post back to itself. How can control be transferred to a different page This section offers several solutions, along with the benefits and drawbacks of each. In the following examples, the user is presented with a list of orders. The user selects an order and clicks the GetDetails button. A control called ctlOrderID, is assumed to hold the OrderID of the order in which the user wishes to view details.
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HyperLink and HyperLink Control
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The HyperLink control allows page navigations through the HyperLink s NavigateURL property. The NavigateURL property can be set from within the code-behind page, and it may contain a constructed URL. The following code sample shows how to program the Page_Load method of the code-behind page. This sample assumes that the Web form page contains a HyperLink control called HyperLink1.
Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load Put user code to initialize the page here Dim OrderID as Integer
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Assign OrderID to a value obtained from the database HyperLink1.NavigateUrl = _ OrderDetails.aspx OrderID= & OrderID HyperLink1.Target = _blank End Sub
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This code builds and sets the NavigateURL, typically based on a database query result. The Hyperlink also has a Target property, which is the type HTML target attribute. When set to _blank, a new browser is opened to contain the OrderDetails page. The advantages of the Hyperlink control include the following:
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This method can be used to call ASP pages as well as ASPX pages. This method allows a new browser child window to be opened to hold the results.
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The disadvantages to it include the following:
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This method does not post any data. This means that all data entered on the Order page can be lost. The URL is limited in size. The URL should be limited to 1,024 bytes in order to accommodate all browsers. Although this method can open a new browser window, the child window is not easily accessible from the parent window, so it is difficult to close the child window when the parent window is closed.
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Window.Open
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Window.Open is a client-side script command. This can be used when it is desirable to open the OrderDetails in a second window. Using this approach requires the use of a standard HTML tag to execute the client-side script. The following is a sample implementation:
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<%@ Page Language= vb Codebehind= Order.aspx.vb Inherits= ch3.Orders %> <HTML> <HEAD> <script language= javascript > <!-var w=null; function btnClick() { var URL; URL = OrderDetails.aspx OrderID= + document.all[ OrderID ].value;
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w=window.open(URL); } function closewindows() { //was the window opened if(w != null) { //if so, was it closed if(!w.closed) { //close it w.close(); } } } //--> </script> </HEAD> <body onunload= return closewindows(); > <form id= Form1 method= post runat= server > <asp:textbox id= OrderID runat= server > </asp:textbox> <input type= button id= GetOrder value= GetOrder onclick= return btnClick(); /> </form> </body> </HTML>
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If the OrderID is 123, the btnClick method constructs a URL of OrderDetails.aspx OrderID=123, and then the window.open function is used to open a new browser window, using the URL that was created. The sample also shows how window.open returns a reference to the window that was opened. In the body tag, onunload is programmed to execute closewindows, which uses the reference to the OrderDetails to close the window when this window is closed. The OrderDetails.aspx.vb code-behind page can extract the OrderID from the QueryString with the following code:
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Private Sub Page_Load(ByVal sender As System.Object, ByVal _ e As System.EventArgs) Handles MyBase.Load Dim OrderID As String = Request.QueryString( OrderID ) Look up order details based on this order End Sub
The advantages to using the window.open function are as follows:
This method can be used to call ASP pages as well as ASPX pages. This method allows a new browser child window to be opened to hold the results, and the child can be autoclosed if the parent window is closed.