Error Trapping In Asp
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Working with Multiple Environments Hosting Managing Application State Servers Request Features Open Web Interface for .NET (OWIN) Choosing the Right .NET For You on the https://docs.asp.net/en/latest/fundamentals/error-handling.html Server MVC Testing Working with Data Client-Side Development Mobile Publishing http://www.4guysfromrolla.com/webtech/060399-1.shtml and Deployment Guidance for Hosting Providers Security Performance Migration API Contribute ASP.NET Docs » Fundamentals » Error Handling Edit on GitHub Warning This page documents version 1.0.0-rc1 and has not yet been updated for version 1.0.0 Error Handling¶ By Steve Smith When on error errors occur in your ASP.NET app, you can handle them in a variety of ways, as described in this article. Sections Configuring an Exception Handling Page Using the Developer Exception Page Configuring Status Code Pages Limitations of Exception Handling During Client-Server Interaction Server Exception Handling Startup Exception Handling ASP.NET MVC Error Handling asp on error View or download sample code Configuring an Exception Handling Page¶ You configure the pipeline for each request in the Startup class's Configure() method (learn more about Application Startup). You can add a simple exception page, meant only for use during development, very easily. All that's required is to add a dependency on Microsoft.AspNetCore.Diagnostics to the project and then add one line to Configure() in Startup.cs: public void Configure(IApplicationBuilder app, IHostingEnvironment env) { app.UseIISPlatformHandler(); if (env.IsDevelopment()) { app.UseDeveloperExceptionPage(); } The above code includes a check to ensure the environment is development before adding the call to UseDeveloperExceptionPage. This is a good practice, since you typically do not want to share detailed exception information about your application publicly while it is in production. Learn more about configuring environments. The sample application includes a simple mechanism for creating an exception: public static void HomePage(IApplicationBuilder app) { app.Run(async (context) => { if (context.Reque
Tutorials MSDN Communities Hub Official Docs Security Stump the SQL Guru! XML Info Information: Feedback Author an Article Published: Thursday, June 03, 1999 Error Handling in ASP You just finished your ASP application in time, barely making the dealine! As you upload the final version to the webserver, you receive an email from your supervisor indicating that he's ready for your demo. You confidently stride into his office and give him instructions on accesses the application through the Intranet. -continued- Your boss comes to the first page, and is asked to enter his name. You've created a slick, customized feel to the site, recording the user and his or her preferences in a database. Your boss types in his name, "The Pointy Haired Boss," and hits the submit button. Instead of being taken to the next page, he sees the following text pop up on the screen: Microsoft OLE DB Provider for ODBC Drivers error ' 80004005' [Microsoft][ODBC Access 97 ODBC driver Driver] syntax wrong near ' Please note that I just made this error message up, so, please, no emails asking about how one gets this error by entering his name! You get one of those looks from your boss, a look that says, "I hope you weren't expecting a positive performance review." There's nothing worse to an end user than to see those dreaded ADO errors. They are misformatted, cryptic, and leave the user wondering what they are suppose to do. Your average end user doesn't know ODBC from OLE. So how can you prevent these nasty error messages? First you must insert at the top of your ASP page:
<% On Error Resume Next %>This will tell ASP to just skip over any errors, instead of halting execution and printing out a nasty error message. You may be tempted to leave it at this, although if you do, and errors occur, your users won't be aware of them. They will think their information was correctly saved, wh