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Following this Microsoft Tutorial when I run the PM> Add-Migration MyFirstMigration command in VS2015 project created from the same tutorial I get the following error that I can't resolve:
More than one DbContext was found. Specify which one to use.
Use the '-Context' parameter for PowerShell commands and the '--context' parameter for dotnet commands.
Point to note
Individual User Account authentication instead of No Authentication used in the tutorial.ASP.NeT Core 1.0 and VS2015-Update 3 on windows 8.1 
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Add-Migration - The Term 'Add-Migration' Is Not Recognized After creating models and context class, we nomally add migration to initialize the database. The error occurs sometimes while adding migration in asp.net core, entity framework with code first approach because of some missing library.
Adding a Migration So, firstly, you need to create a migration. Open the Package Manager Console from the menu Tools -> NuGet Package Manager -> Package Manager Console in Visual Studio and execute the following command to add a migration.
Delete the row corresponding to your migration that you want to unapply (Say "yes" to the warning, if prompted). Run "dotnet ef migrations remove" again in the command window in the directory that has the project. json file. Alternatively, run "Remove-Migration" command in the package manager console.
Running the following command (obtained from this article) and a response from @Maverik (from StackOverflow here) and a suggestion from @doctor above helped me resolved the issue. Thank you all for your help:
PM> Add-Migration MyFirstMigration -Context BloggingContext The error clearly explains to mention --context with db Context name if more than one DbContext. So try by mentioning your DbContext name.
dotnet ef migrations add Initial --context SampleDbContext Hope this helps.
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