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System.InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first.
at System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command)
at System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
at System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult)
at System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries)
at System.Data.Linq.SqlClient.SqlProvider.CompiledQuery.Execute(IProvider provider, Object[] arguments)
at System.Data.Linq.CommonDataServices.DeferredSourceFactory`1.ExecuteKeyQuery(Object[] keyValues)
at System.Data.Linq.CommonDataServices.DeferredSourceFactory`1.Execute(Object instance)
at System.Data.Linq.EntitySet`1.Load()
at System.Data.Linq.EntitySet`1.GetEnumerator()
at System.Linq.Enumerable.First[TSource](IEnumerable`1 source, Func`2 predicate)
at System.Web.Mvc.PathExtensions.Path(Party party) in E:\ERP\ERP.Web.Directory\Code\ErpExtensions.cs:line 45
at System.Web.Mvc.PathExtensions.Url(Party party) in E:\ERP\ERP.Web.Directory\Code\ErpExtensions.cs:line 38
at System.Web.Mvc.PathExtensions.Link(Party party, Boolean useNativeName) in E:\ERP\ERP.Web.Directory\Code\ErpExtensions.cs:line 24
at CompiledRazorTemplates.Dynamic.ebdfbaaeccfc.Execute()
at RazorEngine.Templating.TemplateBase.Run(ExecuteContext context)
at System.Web.Mvc.HtmlTemplateBase`1.Run(ExecuteContext context)
at CMS.Core.ITemplateExtensions.Run[T](ITemplate template, T Model)
at CMS.Core.ITemplateExtensions.Parse[T](String template, T Model)
@{var books = ERP.Data.DBContext.Current.Product.Active().OrderByDescending(i => i.DateUpdated).ToList();}

Recently Updated Books

@foreach(var item in books.Take(12)) {
View Book

@item.Name
@item.NativeName

@(item.Authors().Any()? item.Authors().First().NativeName:"")

@if(item.SalePrice.HasValue){

BDT @item.SalePrice.Value.ToString("0.00") BDT @item.ListPrice.Value.ToString("0.00")

}else if (item.ListPrice.HasValue) {

BDT @item.ListPrice.Value.ToString("0.00")

}
Details
Cart
}
Error: 
Value cannot be null.
Parameter name: writer

Low-Cost Masking/NonMasking SMS in Bangladesh - Alpha SMS

Alpha SMS is an advanced SMS service provider in Bangladesh with multiple services such as Bulk SMS, SMS API, OTP SMS, SMS Gateway, SMS Marketing, Masking SMS, Non-Masking, etc. It provides a powerful and easy-to-use SMS API for developers. Easy integration with Software Applications & Websites. You can also send SMS messages directly through SMS Web Panel (Dashboard). Fast and easy to use SMS Gateway for School, Small Business SMS marketing, ISP & NGO in Bangladesh. Alpha SMS also offers API Integration with Corporate applications.

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Low-Cost Masking/NonMasking SMS in Bangladesh - Alpha SMS
@{ var db = ERP.Data.DBContext.Current; var authors = db.Party.Active().Where(p => p.TypeId == 1017 && db.PartyProduct.Any(i => i.PartyId == p.Id)); var books = ERP.Data.DBContext.Current.Product.Active(); }

A National Archive of Information

@ERP.Data.Service.BusinessService.ByType("Publisher").Count()

Publishers

Featuring complete portfolio & virtual showroom of @ERP.Data.Service.BusinessService.ByType("Publisher").Count() active Publishers in Bangladesh.

@authors.Count().ToString("#,###")

Authors

Portfolio of an ever growing list of legends. About 3,000 Bengali authors & Poets of the past, present & future.

@books.Count().ToString("#,###")

Books

A complete online catalog of Bangla books. From the everlasting classics to modern literature of the future generation.

Error: 
Value cannot be null.
Parameter name: writer