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Thursday, November 17, 2011

WriteLog() - The Easy Way to Display Debugging Information in ASP.NET

It can often be difficult to display information in ASP.NET because System.Diagnostics, Response.Write, or the Trace object are not available - for example, when you are working in the global.asax or inside a class.

A simple way to display what lines are executing and what information is in a given field is by creating a simple  WriteLog() method in a class in the App_Code folder. Then, when you want to display the contents of a field anywhere in your program, you just use:

C#:
clsWriteLog.WriteLog("strXyz: " + strXyz);

VB.NET:
clsWriteLog.WriteLog("Line 203 executed")

You have two ways to view what is written to the log:

1. While in Visual Studio, you look at trace.log file in your root directory.

2. While in the website, you type http://www.yourwebsitename.com/trace.log

You can download the few lines of code for the class  clsWriteLog at clsWriteLog .  The code for the class is provided in vb.net and c#.

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