Sometimes while debugging ASP.Net applications, intermittently you may get an error like this.

HTML5 comes with lot of new APIs, one of the my favorite is File Reader. The File Reader API helps to read and manipulate contents of the files. Here is the code snippet, which helps to select multiple image files using file browser control and upload to server using JQuery.

Load testing is the process of putting demand on a system or device and measuring its response. Load testing is performed to determine a system’s behavior under both normal and anticipated peak load conditions. It helps to identify the maximum operating capacity of an application as well as any bottlenecks and determine which element is causing degradation. This post is about Load testing the ASP.Net Web API using Apache JMeter. The Apache JMeter desktop application is open source software, a 100% pure Java application designed to load test functional behavior and measure performance. You can download JMeter from here.

This post is about self hosting your Web API controller. Similar to WCF, Web API can be hosted either on IIS or in Windows Process, can be a windows application or console application or a windows service. Self hosting can be used for unit testing purposes also, instead of mocking can use the in memory server. In this post I am hosting the web api in a console application.

While developing an intranet application, I had to use Active Directory to authenticate the users. I thought I might need to use WMI. But I found a simple solution using PrincipalContext class from the System.DirectoryServices.AccountManagement namespace. You can use the ValidateCredentials() method. You need to pass the domain name as one of the parameter to this function. Here is the snippet.

This post is about unit testing Web API controller. As we are using Entity Framework and some Web API related classes, we need to implement dependency injection to unit test Web API controllers.

I couldn’t complete this series without mentioning the model validations part. Like normal services you can do custom validations, if validation fails, can create error responses and return. Similar to ASP.Net MVC, WebAPI also supports Model validations using DataAnnotations. And in the code you can use ModelState.IsValid property to validate Model is valid or not. For the validation purposes I modified the Employee model class like this.