ADO.NET :: Unable To Fetch Just One Integer Value Using This LINQ-query

I'm unable to fetch just one integer value using this LINQ-query. LINQ seems to return everything as IEnumerable but I don't want that. First query should return just one string value which is then used in another query. That one should return integer which is also return value for method:

public static long GetTableIdByTableName(string name)
{
var result = (from aTable in objScope.Extent<Table>()
where aTable.Name == name
select { aTable.Id });
return ???????????
}