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Exception System.InvalidOperationException: A second operation was started on this context instance before a previous operation completed. This is usually caused by different threads concurrently using the same instance of DbContext. For more information on how to avoid threading issues with DbContext, see https://go.microsoft.com/fwlink/?linkid=2097913. at Microsoft.EntityFrameworkCore.Infrastructure.Internal.ConcurrencyDetector.EnterCriticalSection() at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.Enumerator.MoveNext() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Boolean& found) at lambda_method57(Closure, QueryContext) at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.ExecuteCore[TResult](Expression query, Boolean async, CancellationToken cancellationToken) at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.Execute[TResult](Expression query) at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.Execute[TResult](Expression expression) at System.Linq.Queryable.First[TSource](IQueryable`1 source) at FatherSiteCore.Controllers.TiresController.Index(String Brend, Nullable`1 Width, Nullable`1 Height, String Radius, String TypeOfTire, String Articul, Nullable`1 page, Nullable`1 countPages) in C:\Users\sasha\Source\Repos\FatherSiteCore\FatherSiteCore\Controllers\TiresController.cs:line 332