public async Task <IActionResult> Delete(int id, [FromQuery] Int32 hid = 0)
        {
            if (hid <= 0)
            {
                return(BadRequest("HID is missing"));
            }

            String usrName = String.Empty;

            if (Startup.UnitTestMode)
            {
                usrName = UnitTestUtility.UnitTestUser;
            }
            else
            {
                var usrObj = HIHAPIUtility.GetUserClaim(this);
                usrName = usrObj.Value;
            }
            if (String.IsNullOrEmpty(usrName))
            {
                return(BadRequest("User cannot recognize"));
            }

            SqlConnection  conn        = null;
            String         queryString = "";
            String         strErrMsg   = "";
            HttpStatusCode errorCode   = HttpStatusCode.OK;
            SqlCommand     cmd         = null;
            SqlTransaction tran        = null;

            try
            {
                using (conn = new SqlConnection(Startup.DBConnectionString))
                {
                    await conn.OpenAsync();

                    // Check Home assignment with current user
                    try
                    {
                        HIHAPIUtility.CheckHIDAssignment(conn, hid, usrName);
                    }
                    catch (Exception)
                    {
                        errorCode = HttpStatusCode.BadRequest;
                        throw;
                    }

                    // Step 1. Delete events for recur
                    tran = conn.BeginTransaction();

                    queryString     = HIHDBUtility.Event_GetNormalEventForRecurDeletionString();
                    cmd             = new SqlCommand(queryString, conn);
                    cmd.Transaction = tran;
                    HIHDBUtility.Event_BindNormalEventForRecurDeletionParameters(cmd, hid, id);
                    await cmd.ExecuteNonQueryAsync();

                    cmd.Dispose();
                    cmd = null;

                    // Step 2. Delete recur item
                    queryString     = HIHDBUtility.Event_GetRecurEventDeletionString();
                    cmd             = new SqlCommand(queryString, conn);
                    cmd.Transaction = tran;
                    HIHDBUtility.Event_BindRecurEventDeletionParameters(cmd, hid, id);
                    await cmd.ExecuteNonQueryAsync();

                    cmd.Dispose();
                    cmd = null;

                    tran.Commit();
                }
            }
            catch (Exception exp)
            {
#if DEBUG
                System.Diagnostics.Debug.WriteLine(exp.Message);
#endif
                strErrMsg = exp.Message;
                if (errorCode == HttpStatusCode.OK)
                {
                    errorCode = HttpStatusCode.InternalServerError;
                }

                if (tran != null)
                {
                    tran.Rollback();
                }
            }
            finally
            {
                if (tran != null)
                {
                    tran.Dispose();
                    tran = null;
                }
                if (cmd != null)
                {
                    cmd.Dispose();
                    cmd = null;
                }
                if (conn != null)
                {
                    conn.Dispose();
                    conn = null;
                }
            }

            if (errorCode != HttpStatusCode.OK)
            {
                switch (errorCode)
                {
                case HttpStatusCode.Unauthorized:
                    return(Unauthorized());

                case HttpStatusCode.NotFound:
                    return(NotFound());

                case HttpStatusCode.BadRequest:
                    return(BadRequest(strErrMsg));

                default:
                    return(StatusCode(500, strErrMsg));
                }
            }

            return(Ok());
        }