Global.asax.cs

using System.Web;
using System.Web.Http;
using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;
using WebApi.App_Start;

namespace WebApi
{
    public class WebApiApplication : HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            UnityWebActivator.Start();
            GlobalConfiguration.Configure(WebApiConfig.Register);
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
        }

        public void FixEfProviderServicesProblem()
        {
            //The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer'
            //for the 'System.Data.SqlClient' ADO.NET provider could not be loaded. 
            //Make sure the provider assembly is available to the running application. 
            //See http://go.microsoft.com/fwlink/?LinkId=260882 for more information.

            var instance = System.Data.Entity.SqlServer.SqlProviderServices.Instance;
        }
    }
}