diff --git a/IRaCIS.Core.Application/Service/Allocation/TaskAllocationRuleService.cs b/IRaCIS.Core.Application/Service/Allocation/TaskAllocationRuleService.cs
index b67e0f64..64246141 100644
--- a/IRaCIS.Core.Application/Service/Allocation/TaskAllocationRuleService.cs
+++ b/IRaCIS.Core.Application/Service/Allocation/TaskAllocationRuleService.cs
@@ -165,9 +165,13 @@ namespace IRaCIS.Core.Application.Service
                             UserCode = user.UserCode,
                             UserName = user.UserName,
                             UserTypeEnum = user.UserTypeRole.UserTypeEnum,
-                            ReadingCategoryList = allocationRule.Enroll.EnrollReadingCategoryList.AsQueryable()
-                           .WhereIf(selectQuery.ReadingCategory != null,t=> t.ReadingCategory == selectQuery.ReadingCategory)
-                           .WhereIf(selectQuery.TrialReadingCriterionId != null, t =>  t.TrialReadingCriterionId == selectQuery.TrialReadingCriterionId)
+
+                            ReadingCategoryList = selectQuery.TrialReadingCriterionId == null  ?
+                            allocationRule.Enroll.EnrollReadingCategoryList
+                           .Select(t => t.ReadingCategory).OrderBy(t => t).ToList():
+
+                            allocationRule.Enroll.EnrollReadingCategoryList
+                           .Where( t =>  t.TrialReadingCriterionId == selectQuery.TrialReadingCriterionId)
                            .Select(t => t.ReadingCategory).OrderBy(t=>t).ToList()
                         };