[Solved] Class Library (.Net Framework) not supporting Entity Framework

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Finally, I found solution to this.
When I install Entity Framework, EF places some default code in application’s config file. As below:

Problem Code:

<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
    <parameters>
        <parameter value="mssqllocaldb" />
    </parameters>
</defaultConnectionFactory>

Solution:

This was root of the problem I was facing. By default it was creating a local connection string for itself. I made following changes: 

1.) Changed "LocalDbConnectionFactory" to "SqlConnectionFactory"
2.) Removed parameters tag completely.

So it should look like this:

<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />

solved Class Library (.Net Framework) not supporting Entity Framework