Unfortunately Azure API not supporting Contains LINQ expressions .
Contains Syntax:
LINQ
public static Product[] GetProducts(Guid[] prodIDs)
{
return (from p in GetProducts()
where prodIDs.Contains(p.ProductID)
select p).ToArray<Product>();
}
TSQL expression – WHERE [t0].[ProductID] IN (@p0, @p1)’,
LINQ contains syntax example has been taken from http://weblogs.asp.net/dwahlin/archive/2008/05/09/using-linq-to-perform-quot-where-in-value1-value2-quot-queries.aspx