How to resolve "Cannot drop database because it is currently in use" error

Run a ALTER DATABASE command like below before dropping the database:

USE [master]
GO
ALTER DATABASE [databaseName] SET  SINGLE_USER WITH ROLLBACK IMMEDIATE
GO

USE [master]
GO

DROP DATABASE [databaseName]
GO

Visual Studio Online

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• 5 FREE Basic user licenses
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Visual Studio 2015

Some new features in Visual Studio 2015:

• Visual Studio 2015 RC Downloads
• .Net in GitHub
• Vsual Studio Code
• Visual Studio Online
• Visual Studio 2015 includes Xamarin integrated for mobile development
• Cordovo tooling in Visual Studio 2015
• .Net and microservices
• Don't have to build to run a web app
• All source code are in Git hub (example Asp.Net MVC source code). If we get source code, source reference will override nuget package.
• Dev and Test in Cloud - use virtual machines
• Debugging
  • Performance step (no more debug trace lines)
  • Applying linq queries with lamda expression in the output window while debugging
  • Editing the linq query real time while debugging

Entity Framework Power Tools

Found this cool entity framework power tool to do reverse engineering for creating code first entity framework data models from an existing database.

Install the Entity Framework Power Tools Beta 4 from here:
https://visualstudiogallery.msdn.microsoft.com/72a60b14-1581-4b9b-89f2-846072eff19d

Once the tool is installed, you should be able to access the entity framework reverse engineer plugin from Visual Studio.

Right click on your solution in Visual Studio and you should see menu option for reverse engineer:
"Entity Framework" -> "Reverse Engineer Code First"

Create a class library for your data layer and click "Reverse Engineer Code First" menu option. Folowwing the instructions to create entity framework data models for an existing database.

Memory gates checking failed because the free memory is less than 5% of total memory

I got this exception when running a service on my localhost:

"Memory gates checking failed because the free memory (180146176 bytes) is less than 5% of total memory.  As a result, the service will not be available for incoming requests.  To resolve this, either reduce the load on the machine or adjust the value of minFreeMemoryPercentageToActivateService on the serviceHostingEnvironment config element."

 I checked memory usage in task manager and the free memory was indeed less than 5%.

Easy fix for this issue is to set "minFreeMemoryPercentageToActivateService" value in "serviceHostingEnvironment" configuration to 0:

<system.serviceModel>

<serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" minFreeMemoryPercentageToActivateService="0"/>
</system.serviceModel>

Cannot drop database because it is currently in use error

We might get following error when we try to drop a database in SQL Server:

"Cannot drop database 'MyDatabaseName' because it is currently in user".

To resolve this error, alter the database first before deleting the database like below..

USE [master]

GO

ALTER DATABASE [MyDatabaseName] set single_user with rollback immediate

DROP DATABASE [MyDatabaseName]

GO

Visual Studio solution file opens in notepad!

If you edit your visual studio solution (.sln) file in notepad and after that if the solution file always opens in notepad by default, then this is what you need to make the solution file open back in visual studio again:

1. Right click on the solution file, select "Properties"
2. Look for "Opens with:" option and change it to your Visual Studio version.