how to generate qr code in c# web application Using application-level tracing in C#.NET

Generating QR-Code in C#.NET Using application-level tracing

Using application-level tracing
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. . 1 . . Open the DebugORama project . Open the TraceMe .aspx page . Turn off tracing in the page by ensuring the Page class s Trace property is set to false . 2 . . Ensure that application-level tracing is turned on in web .config . That is, open web .config and add a trace element, as shown earlier . If the application doesn t yet have a configuration file, you can add one by selecting Add New Item from the local project menu . 3 . . Surf to the TraceMe .aspx page a few times by pressing Ctrl+F5, and then adding a few strings to the table . 4 . . In the URL that appears in the address box, make the endpoint Trace.axd, as shown in the following graphic . This name in the URL redirects request processing through a special handler that renders the tracing results being kept in memory .
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. .
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Part IV
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5 . . You should be able to see a list of requests . You can see individual requests and the request details, as shown in the following graphic, by clicking the View Details link .
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Notice how the output is exactly the same as the output of the earlier page tracing example . However, now the tracing information stands alone without cluttering up the Web page .
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17 Diagnostics and Debugging
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Enabling Tracing Programmatically
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Although much of the time you will enable tracing through the Designer, at times you might find it useful to manage tracing during run time (programmatically) . For example, you might have regular clients receive normal content; however, when someone with specific credentials appears, you might want to enable tracing for that individual . You might also decide to modify tracing when a certain parameter comes through the request . The DebugORama site includes a page named EnableTracing .aspx that illustrates how to control the tracing programmatically . If the user types the correct password, the tracing is turned on . The page also shows how to enable and disable tracing programmatically .
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public partial class EnableTracing : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void Button1_Click(object sender, EventArgs e) {
} protected void Button2_Click(object sender, EventArgs e) { this.Trace.IsEnabled = false; }
if (this.TextBoxSecretCode.Text == "password") { this.Trace.IsEnabled = true; }
The TraceFinished Event
The tracing context includes an interesting event named TraceFinished that gives you a last chance opportunity to log the tracing information or deal with it in some other way . The TraceFinished event is raised by the Trace object after all request information is gathered . To subscribe to the event, simply set up the handler during the Page_Load event . The DebugORama example includes a page named TraceFinished .aspx that shows how the trace information was gathered and written to the debug console using System.Diagnostics.Debug .
public partial class TraceFinished : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { Trace.TraceFinished += new TraceContextEventHandler(TracingFinished); }
Part IV
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void TracingFinished(object sender, TraceContextEventArgs e) { foreach (TraceContextRecord traceContextRecord in e.TraceRecords) { System.Diagnostics.Debug.WriteLine(traceContextRecord.Message); } }
Piping Other Trace Messages
In the last example, tracing messages were logged manually to the debug console by setting up the TraceFinished event handler in the Trace context . System.Diagnostics.Debug is a standard .NET type that s helpful for managing tracing and debugging information . Since version 2 .0, ASP .NET has had the ability to plug in the WebPageTraceListener type so that calls to System.Diagnostics.Trace are also inserted into the ASP .NET trace . Setting it up is simply a matter of inserting a line in web .config (note the writeToDiagnosticsTrace option in Table 17-1) . A case in which this is useful is for logging compiler output . To do this, set the writeToDiagnosticsTrace option to true, and then turn on compiler tracing . Compiler tracing is another setting you can set in web .config, but notice that this lies outside the typical System.web section of web .config .
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