public int RemoveCredentialSet(string serviceBrokerGuid, string serviceBrokerName,
     string groupName, string ussGuid)
 {
     LabSchedulingDB dbManager = new LabSchedulingDB();
     if (dbManager.AuthenticateAgentHeader(agentAuthHeader))
     {
         return dbManager.RemoveCredentialSet(serviceBrokerGuid, serviceBrokerName, groupName);
     }
     else
         return 0;
 }