Thomas Ardal

Thomas Ardal

Denmark
212 posts
Debugging System.NullReferenceException - Object reference not set to an instance of an object

Time for another post in the series Debugging common .NET exceptions. Today's exception is, without a doubt, the error most people have experienced: System.NullReferenceException. The exception happens when you try to invoke a reference that you were expecting to point to an object but in fact, points to null. ...

How to write to a file with C# in 2019 - StackOverflow doesn't get it right

Today's tip isn't exactly about a hot new version of ASP.NET Core or anything like that. I often find myself googling "simple" questions like how to write text to a file in the most quickly and effectively way. Most results are either blog posts using .NET 2 as an ...

C# exception handling best practices

I'm getting near my 20th anniversary in the tech industry. During the years, I have seen almost every anti-pattern when dealing with exceptions (and made the mistakes personally as well). This post contains a collection of my best practices when dealing with exceptions in C#. Decorate exceptionsI see this used ...

Fix max URL and query string length with web.config and IIS

I had a problem the other day that I believe qualifies as a blog post. An elmah.io user reported that refreshing the organization overview would generate a 404. After debugging the problem, I found out that the URL generated by that page can be too long. This post is ...

Partner with BrowserStack to support real-device debugging

When dealing with client-side errors, the combination of a physical device, the operating system, and the browser can be the cause of an error. You probably don't have an old Samsung Galaxy S4 running Android 4 laying in your drawer. Debugging errors like this can be extraordinarily painful, and even ...

Migrating the elmah.io API to ASP.NET Core

We just launched a brand new version of our API. The big difference is that the API is now running on ASP.NET Core (instead of ASP.NET Web API). The new API is backward compatible with all of the existing integrations already using Elmah.Io.Client version 3.x. ...

Structured logging vNext

We have had support for structured logging on elmah.io ever since we released the first integrations with logging frameworks like Serilog and NLog. With today's release, we have made a range of improvements which qualify for an announcement post. When logging messages to elmah.io from a structured logging ...

Web.config location element demystified

I haven't actually met a lot of people who knew the details about the hierarchy of Web.config files and how to utilize the location element. In fact, I've heard multiple people ask "why is there a Web.config file in the Views folder of my MVC application?". Even ASP. ...

Web.config redirects with rewrite rules - https, www, and more

Rewrite rules is a powerful feature in IIS. Common tasks like redirecting www to non-www (or the other way around), implementing canonical URLs, redirecting to HTTPS, and similar tasks are documented right there in your Web.config file. In this post, you will learn about the syntax of rewrite rules ...