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Many developers can live with the lack of purity of the returned value, but most developers don t always remember to check the return result for the exceptional value indicating an error In practice, most C programmers do check for the return code from calls to fopen because it has a fairly large chance of failure However, many C programmers do not check for errors in functions like fputs because that function, using a valid file pointer, fails relatively rarely Thus, many file writes will fail because the disk is full or, for other reasons, go unnoticed The second model for error handling is exception handling In this sort of system, an error throws an exception and that exception bubbles up the stack until an appropriate handler is found.

Sample of Visual Basic Code Dim _callbackArgs As String Public Sub RaiseCallbackEvent(ByVal eventArgument As String) _ Implements System.Web.UI.ICallbackEventHandler.RaiseCallbackEvent _callbackArgs = eventArgument End Sub Sample of C# Code string _callbackArgs; public void RaiseCallbackEvent(string eventArgument) { _callbackArgs = eventArgument; }

You also would have to implement the GetCallbackResult method. This method returns a result back to the client following the server-side processing. In our example, we simply return the user s selected item from the DropDownList. In a real-world scenario, you might do some processing, calling the database, and so forth. The code for this method looks as follows.

the DNS and WINS server addresses. In this configuration, the Routing And Remote Access Server Setup Wizard cannot automatically configure the DHCP Relay Agent routing protocol component. You must manually add the

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Sample of Visual Basic Code Public Function GetCallbackResult() As String _ Implements System.Web.UI.ICallbackEventHandler.GetCallbackResult Return _callbackArgs End Function Sample of C# Code public string GetCallbackResult() { return _callbackArgs; }

The next step is to add code to the page load event that registers the various client scripts. First, you register the client script that will be called by the server following the server-side processing. In this example, this script is called ClientCallbackFunction. This function is defined in the markup for the page. Next, you create a JavaScript function that is used to call the serverside code. In the example, this function is called MyServerCall. It is referenced in the page markup to make the server-side call. You register this function with the ClientScriptManager by using the RegisterClientScriptBlock method, as shown here.

Although Visual Basic offers a sort of exception handling using the On Error statement, the form in which it was exposed wasn t the most convenient For VBScript programmers in ASP, the options were even more limited because the system didn t allow all the control over exception handling Visual Basic or Visual Basic for Applications (VBA) allowed The preferred sort of exception handling is structured exception handling Although structured exception handling is more a feature of the NET Framework than of Visual Basic NET per se, it is a critical change that will allow developers to create far more robust and reliable applications The general form of structured exception handling is shown here: Try Some code that might throw an exception Catch e As Exception Handle the error.

Sample of Visual Basic Code Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Me.Load 'register the name of the client-side function that will ' be called by the server Dim callbackRef As String = Page.ClientScript.GetCallbackEventReference( _ Me, "args", "ClientCallbackFunction", "") 'define a function used by the client to call the server Dim callbackScript As String = String.Format( _ "function MyServerCall(args) {{0};}, ", callbackRef) 'register the client function with the page Page.ClientScript.RegisterClientScriptBlock(Me.GetType(), _ "MyServerCall", callbackScript, True) End Sub Sample of C# Code protected void Page_Load(object sender, EventArgs e) { //register the name of the client-side function that will // be called by the server string callbackRef = Page.ClientScript.GetCallbackEventReference( this, "args", "ClientCallbackFunction", ""); //define a function used by the client to call the server string callbackScript = String.Format( "function MyServerCall(args) {{0};}, ", callbackRef); //register the client function with the page Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "MyServerCall", callbackScript, true); }

IP address of at least one DHCP server on your intranet for DHCPInform messages to be relayed between VPN clients running Windows XP and Win dows 2000 and the DHCP server. If you do not, DHCPInform messages sent by VPN clients running Windows XP and Windows 2000 are discarded and the VPN clients do not receive the updated DNS and WINS server addresses or the DNS domain name.