System.InvalidOperationException: 'The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' registered in the application config file for the ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded. Make sure that the assembly-qualified name is used and that the assembly is available to the running application. See http://go.microsoft.com/fwlink/?LinkId=260882 for more information.'
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        public dbQLKHOTHUOCEntities()
            : base("name=dbQLKHOTHUOCEntities")
        {
        }
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