Если в EntityDataSource запрос указывает проекцию и включено разбиение на страницы, то необходимо определить выражение сортировки. Задайте свойство OrderBy или установите AutoGenerateOrderByClause в значение true.

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For the EntityDataSource, if the query specifies a projection and paging is enabled, a sort expression must be defined. Either set the OrderBy property or set AutoGenerateOrderByClause to true.

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