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System.ArgumentException: An item with the same key has already been added.
at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
at System.Data.Linq.DataContext.GetTable(MetaTable metaTable)
at System.Data.Linq.CommonDataServices.GetDataMemberQuery(MetaDataMember member, Expression[] keyValues)
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.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.First[TSource](IEnumerable`1 source)
at CompiledRazorTemplates.Dynamic.eecceadfcbcc.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();}

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@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")

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

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

A National Archive of Information

170

Publishers

Featuring complete portfolio & virtual showroom of 170 active Publishers in Bangladesh.

4,623

Authors

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

29,332

Books

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