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MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide in Visual C#
MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide GTIN - 12 Generator In Visual C# Using Barcode maker for VS .NET Control to generate, create UPC Symbol image in .NET framework applications. UPC A Recognizer In Visual C# Using Barcode recognizer for .NET framework Control to read, scan read, scan image in VS .NET applications. The final step is to write the entry to the Event Log by using the WriteEntry() method of the EventLog object The text you include in the message should be descriptive, and use as full a description as possible The Windows operating system adds a stock header to the Event Log entry, which can be seen in Figure 15-9 Create Barcode In Visual C# Using Barcode maker for VS .NET Control to generate, create bar code image in Visual Studio .NET applications. Decode Barcode In C#.NET Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET framework applications. Page-Level Tracing
Creating UPC-A Supplement 5 In Visual Studio .NET Using Barcode generation for ASP.NET Control to generate, create Universal Product Code version A image in ASP.NET applications. UPC-A Supplement 5 Generation In Visual Studio .NET Using Barcode maker for .NET Control to generate, create UPC-A Supplement 2 image in .NET applications. To debug ASPNET applications, and in particular, debug client user interfaces, you need to make use of the tracing facility This facility has greatly improved the debugging services compared to what was available for the ASP environment ASP debugging was not the most developer-friendly activity to undertake debugging was a chore, and trying to get information from the running system entailed creating code that looked like this: Print GS1 - 12 In Visual Basic .NET Using Barcode creation for VS .NET Control to generate, create UPC A image in .NET framework applications. Printing Linear 1D Barcode In C#.NET Using Barcode creator for .NET Control to generate, create 1D Barcode image in VS .NET applications. if (DEBUG == true) { ResponseWrite("x = " + pointX + ", y = " + pointy); } Creating EAN / UCC - 14 In C# Using Barcode maker for .NET framework Control to generate, create USS-128 image in Visual Studio .NET applications. Code 128A Printer In Visual C# Using Barcode drawer for .NET Control to generate, create Code 128 Code Set A image in VS .NET applications. The value of the global variable DEBUG determined what the output would be Then we had to thread through the code to locate the problem spot, which was not very much Drawing Data Matrix 2d Barcode In Visual C#.NET Using Barcode encoder for Visual Studio .NET Control to generate, create Data Matrix image in .NET framework applications. UPCE Creation In C#.NET Using Barcode generation for .NET Control to generate, create UPC-E Supplement 2 image in Visual Studio .NET applications. Figure 15-9 The message written into the Event Log
Make Barcode In Visual Studio .NET Using Barcode creator for ASP.NET Control to generate, create bar code image in ASP.NET applications. Generate Code 3/9 In .NET Framework Using Barcode generator for ASP.NET Control to generate, create Code 3/9 image in ASP.NET applications. 15: Web Forms and User Interface
Read Barcode In VS .NET Using Barcode reader for .NET Control to read, scan read, scan image in Visual Studio .NET applications. UPC-A Printer In Java Using Barcode printer for BIRT reports Control to generate, create UPC Code image in BIRT applications. fun And if you forgot to set DEBUG to False, the debug information ended up on the client systems EXAM TIP If you are given the option to use global DEBUG variables and ResponseWrite() calls, you know they are referring to the previous version and that these are wrong answers In ASPNET, we have a new way of debugging our applications Tracing does away with the hard-coded DEBUG testing, and the consequent runtime errors that make it even harder to get a page working properly The trace feature provides a large number of information points for the page, including performance data, server variables, and any messages the developer has added to the page To use page-level tracing, you need to add one page directive at the top of the web page to inform ASPNET that you require tracing information for that page This is the directive: Decode EAN-13 In C# Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications. Make Bar Code In .NET Framework Using Barcode generator for Reporting Service Control to generate, create bar code image in Reporting Service applications. <%@ Page Trace="true" %>
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EXAM TIP The Trace directive overrides the trace setting for the application in the Webconfig file
In order to look at what is returned from the trace feature, we built a Web Form The following code is all that is needed: <%@ Page language="c#" Codebehind="WebForm1aspxcs" AutoEventWireup="false" Inherits="TracerWebForm1" trace="True"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 40 Transitional//EN" > <HTML> <HEAD> <title>WebForm1</title> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" runat="server"> <asp:TextBox id="TextBox1" runat="server"></asp:TextBox> <asp:Button id="Button1" runat="server" Text="Button"></asp:Button> <br/><br/><br/> </form> </body> </HTML> Create this application, and then save and build it Run it by pressing F5, and after a short delay you will be presented with the information shown in Figure 15-10 The end result of turning on tracing is that the web server produces the normal content of the Web Form (the TextBox and Button) plus a large number of sections that give us information about the page and the processes on that page The sections in the trace output are listed in Table 15-8 MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide
Figure 15-10 The output from the trace
Now that you ve seen the sections of the trace output, we need to look at how to insert messages into the trace log There are two methods that can be used to insert custom messages into the Trace Information section TraceWrite(); TraceWarn(); 15: Web Forms and User Interface
Description
Request Details
Trace Information
Control Tree
Cookies Collection Headers Collection Server Variables Table 15-8 This section deals with the client s request for the page, and includes information such as the session ID for the current session, the request type (GET or POST), the date and time of the request, and the encoding of the request and response This is the section where trace information, as well as any messages we added to the page, will be presented The display can be used to determine the performance of the server for this page request, as well as to see the order of the page generation This section displays the inheritance of the controls on the page (Page is the root), as well as the control IDs, type, and size of the view state This section contains information about the cookies collection that is attached to the web page This section lists the different headers that the client sent to the server as part of the request for the page This section is where the different variables available through the Server object are displayed
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