How to read the cached value from domain specified.?

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cache

I have written a code to store the data in the system memory . I have a requirement to filter the data on the basis of the domain that I have specified while I have created the cache other than the key value.

Sample code is as below :-

public TaskDetails GetUpdateXML(int OrgLevelRecID)
        {
            DataTable dtResult = new DataTable();
            TaskDetails lstTaskDetails = new TaskDetails();
            try
            {
                dtSystemTime = DateTime.Now;
                lstTaskDetails = CacheUtil.Get<taskdetails>(OrgLevelRecID, "InstanceID");
                if (lstTaskDetails == null)
                {
                    lstTaskDetails = new TaskDetails();
                    dtResult = FeederClass.GetUpdateXML(OrgLevelRecID);
                    foreach (DataRow reader in dtResult.Rows)
                    {
                        lstTaskDetails.JobType = reader["typeOfJob"].ToString();
                        lstTaskDetails.JobDetails = reader["jobdetails"].ToString();
                    }
                    CacheUtil.SetSliding(OrgLevelRecID, lstTaskDetails, 5, "InstanceID");
                }             
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return lstTaskDetails;
        }

Here : "InstanceID" is the domain for the cache to classify and store the items. Need to get the Data back when I use this Domain as a filer. Any Help ??