from c in context.Table
where key == int.Parse(c.KeyAsString)
order by int.Parse(c.KeyAsString)
select c

var keyString = key.ToString();
var query = from c in context.Table
where keyString == c.KeyAsString
order by c.KeyAsString
select c

var query = from c in context.Table
            let IntOrder = context.Table.Take(1).Select(x => c.KeyAsString).Cast<int>().FirstOrDefault()
            where IntOrder == key
            orderby IntOrder
            select c;