Entity Framework Error - The underlying provider failed on Open

Posted by Anuraj on Tuesday, September 24, 2013

.Net ASP.Net MVC Entity Framework

Yesterday while working on an ASP.Net MVC application, I got an error like this from Entity Framework Data Context. The problem started when I deployed the application in IIS server, while in the development server (IIS Express) it was working fine. In the connection string, I was using Windows Authentication.

How to enable Windows Authentication in IIS Express

Posted by Anuraj on Thursday, September 12, 2013

.Net ASP.Net ASP.Net MVC Visual Studio

Unlike IIS Server, IIS Express doesn’t support Windows Authentication by default. You can enable the Windows Authentication in IIS Express by modifying the applicationhost.config under the “C:\Users[username]\Documents\IISExpress\config” directory. You need to find the windowsAuthentication element under authentication, and change the value of attribute enabled to true.

Cannot create/shadow copy 'File Name' when that file already exists

Posted by Anuraj on Thursday, September 12, 2013

.Net .Net 4.0 ASP.Net ASP.Net MVC Visual Studio

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

How to upload multiple files with HTML5 and JQuery

Posted by Anuraj on Thursday, September 12, 2013

.Net .Net 4.0 ASP.Net MVC HTML5 Javascript

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 Web API using Apache JMeter

Posted by Anuraj on Thursday, September 5, 2013

.Net .Net 4.0 ASP.Net Web API

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.

Self hosting Web API controller

Posted by Anuraj on Wednesday, September 4, 2013

.Net .Net 4.0 Web API Windows Forms

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.

How to authenticate user against active directory

Posted by Anuraj on Wednesday, September 4, 2013

.Net .Net 3.0 / 3.5 .Net 4.0 Windows Forms

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.

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