System.InvalidOperationException: The null value cannot be assigned to a member with type System.Int32 which is a non-nullable value type.
at Read_PartyProduct(ObjectMaterializer`1 )
at System.Data.Linq.SqlClient.ObjectReaderCompiler.ObjectReader`2.MoveNext()
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.fffcfceabde.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)