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string propertyName = GridViewSortExpression;

Func<Entity, object> orderbyField = entity=>entity.GetType().InvokeMember(propertyName, BindingFlags.GetProperty, null, entity, new object[] { });

GridView.DataSource = GridViewSortDirection == SortDirection.Ascending ? entities.OrderBy(orderbyField) : entities.OrderByDescending(orderbyField);