is there a way to dynamically build a Where clause in LINQ? 

Example... today I query my sql db, and only ServerGroup A has issues. I return the fault codes for that group. Works. However, tomorrow, ServerGroup A & B have issues. I do not want to manually change my LINQ query, but have it dynamically add the new ServerGroup to the WHERE clause. Is this possible with LINQ? I've done it with a Sql query.

Greatly appreciate the assistance. 

```
        var query = referenceDt.AsEnumerable()
            .Where(results => results.Field<string>("ServerGroup") == "A" ||
                             results.Field<string>("SeverGroup") == "B")
            .GroupBy(results => new
                {
                    FaultCode = results.Field<int>("FaultCode")
                })
            .OrderByDescending(newFaultCodes => newFaultCodes.Key.FaultCode)
            .Select(newFaultCodes => new
            {
                FaultCode = newFaultCodes.Key.FaultCode,
                Count = newFaultCodes.Count()
            });

```