.Net is an umbrella term for the group of technologies that Microsoft uses to stage its web serving capabilities. You have probably heard of the .Net Framework which ties these technologies together, and the IIS (Internet Information Service) which makes it all possible.

As a side effect of the sophisticated technology in place, .Net does tend to produce quite a large number of errors, especially if you lack the required accuracy with your configuration settings!

It’s also very important to learn to distinguish between problems with the .Net Framework, and problems with a .NET application which is down to poor programming. Anybody can code in ASP.NET.

Here are a few examples of errors that are down to the code of the application.

CS0029: Cannot implicitly convert type ‘object name’ to ’string’

CS0117: ‘object name’ does not contain a definition for ‘Length’

CS0201: Only assignment, call, increment, decrement, and new object expressions can be used as a statement

All of these scenarios indicate lax code, and not necessarily a problem with the .Net framework itself. But of course, if you are receiving errors that indicate a failure to connect to a data source, or a lack of a connection altogether, then you should start to look at the larger picture of server issues and IIS configuration.

There are many sources for errors when using the web services that Microsoft offers. It could be an authorization issue, or something much more serious.

Error handling plays an important part in locating the root of the problem when you’re working on the .NET development side, whether it is with ASP.NET or VB.NET. The technologies that work with the .NET Framework are sophisticated and can be hard to interpret.

If, however, you are receiving errors that relate to the structure of the Framework and the connectivity itself, you might want to look a little deeper to find the solution. Errors such as the examples below represent a problem with the security permissions of the .NET environment itself.

Access denied to ‘C:\Inetpub\Wwwroot’ directory. Failed to start monitoring directory changes.

Server cannot access application directory ‘C:\Inetpub\Wwwroot\ Virtual Directory Name \’. The directory does not exist or is not accessible because of security settings.

In these instances, it’s possible to fix the errors by simply changing the permissions of the root folder involved (wwwroot, in this case). We should allow read, execute and list capabilities for the various .NET technologies to be accessible through the wwwroot folder. Without sufficient permissions, an error will be returned. But as you can see, the error is less to do with the code and more to do with the environment.

Be sure to keep up to date with the latest Microsoft .NET Framework patches and security packs as they are sure to fix many of the errors that you’re likely to encounter. The .NET standard is constantly evolving and so if you leave your software for a couple of months without updating, it’s highly likely that you’ll find a wide range of patches and fixes when you re-visit the Microsoft website.

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