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System.InvalidOperationException: Invalid attempt to call IsDBNull when reader is closed.
at System.Data.SqlClient.SqlDataReader.CheckHeaderIsReady(Int32 columnIndex, Boolean permitAsync, String methodName)
at System.Data.SqlClient.SqlDataReader.IsDBNull(Int32 i)
at Read_Party(ObjectMaterializer`1 )
at System.Data.Linq.SqlClient.ObjectReaderCompiler.ObjectReader`2.MoveNext()
at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source)
at System.Data.Linq.EntityRef`1.get_Entity()
at CompiledRazorTemplates.Dynamic.cafaeeacadaade.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

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