diff --git a/PoweredSoft.DynamicLinq.Test/ShortcutTests.cs b/PoweredSoft.DynamicLinq.Test/ShortcutTests.cs
index 6df24b4..b0312a8 100644
--- a/PoweredSoft.DynamicLinq.Test/ShortcutTests.cs
+++ b/PoweredSoft.DynamicLinq.Test/ShortcutTests.cs
@@ -180,7 +180,7 @@ namespace PoweredSoft.DynamicLinq.Test
         }
 
         [TestMethod]
-        public void NotContains()
+        public void NotContains2()
         {
             var q1 = Persons.AsQueryable().Query(t => t.NotContains("LastName", "ee"));
             var q1b = Persons.AsQueryable().Where(t => !t.LastName.Contains("ee"));
diff --git a/PoweredSoft.DynamicLinq.Test/StringComparision.cs b/PoweredSoft.DynamicLinq.Test/StringComparision.cs
index 431d054..aeaf524 100644
--- a/PoweredSoft.DynamicLinq.Test/StringComparision.cs
+++ b/PoweredSoft.DynamicLinq.Test/StringComparision.cs
@@ -76,6 +76,22 @@ namespace PoweredSoft.DynamicLinq.Test
             QueryableAssert.AreEqual(a, b, "CaseInsensitive");
         }
 
+        [TestMethod]
+        public void NegateNotContains()
+        {
+            IQueryable<MockPersonObject> a, b;
+
+            // case sensitive.
+            a = Persons.AsQueryable().Query(t => t.NotContains("FirstName", "vi", stringComparision: null, negate: true));
+            b = Persons.AsQueryable().Where(t => !!t.FirstName.Contains("vi"));
+            QueryableAssert.AreEqual(a, b, "CaseSensitive");
+
+            // not case sensitive
+            a = Persons.AsQueryable().Query(t => t.NotContains("FirstName", "VI", stringComparision: StringComparison.OrdinalIgnoreCase, negate: true));
+            b = Persons.AsQueryable().Where(t => !(t.FirstName.IndexOf("VI", StringComparison.OrdinalIgnoreCase) == -1));
+            QueryableAssert.AreEqual(a, b, "CaseInsensitive");
+        }
+
         [TestMethod]
         public void StartsWith()
         {
diff --git a/PoweredSoft.DynamicLinq/Fluent/Where/WhereBuilder.shortcuts.cs b/PoweredSoft.DynamicLinq/Fluent/Where/WhereBuilder.shortcuts.cs
index a1439a6..4a04207 100644
--- a/PoweredSoft.DynamicLinq/Fluent/Where/WhereBuilder.shortcuts.cs
+++ b/PoweredSoft.DynamicLinq/Fluent/Where/WhereBuilder.shortcuts.cs
@@ -98,14 +98,14 @@ namespace PoweredSoft.DynamicLinq.Fluent
         #endregion
 
         #region not contains
-        public WhereBuilder NotContains(string path, object value, QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionHandling collectionHandling = QueryCollectionHandling.Any, StringComparison? stringComparision = null)
-            => And(path, ConditionOperators.NotContains, value, convertStrategy: convertStrategy, collectionHandling: collectionHandling, stringComparision: stringComparision);
+        public WhereBuilder NotContains(string path, object value, QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionHandling collectionHandling = QueryCollectionHandling.Any, StringComparison? stringComparision = null, bool negate = false)
+            => And(path, ConditionOperators.NotContains, value, convertStrategy: convertStrategy, collectionHandling: collectionHandling, stringComparision: stringComparision, negate: negate);
 
-        public WhereBuilder AndNotContains(string path, object value, QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionHandling collectionHandling = QueryCollectionHandling.Any, StringComparison? stringComparision = null)
-            => And(path, ConditionOperators.NotContains, value, convertStrategy: convertStrategy, collectionHandling: collectionHandling, stringComparision: stringComparision);
+        public WhereBuilder AndNotContains(string path, object value, QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionHandling collectionHandling = QueryCollectionHandling.Any, StringComparison? stringComparision = null, bool negate = false)
+            => And(path, ConditionOperators.NotContains, value, convertStrategy: convertStrategy, collectionHandling: collectionHandling, stringComparision: stringComparision, negate: negate);
 
-        public WhereBuilder OrNotContains(string path, object value, QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionHandling collectionHandling = QueryCollectionHandling.Any, StringComparison? stringComparision = null)
-            => Or(path, ConditionOperators.NotContains, value, convertStrategy: convertStrategy, collectionHandling: collectionHandling, stringComparision: stringComparision);
+        public WhereBuilder OrNotContains(string path, object value, QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionHandling collectionHandling = QueryCollectionHandling.Any, StringComparison? stringComparision = null, bool negate = false)
+            => Or(path, ConditionOperators.NotContains, value, convertStrategy: convertStrategy, collectionHandling: collectionHandling, stringComparision: stringComparision, negate: negate);
         #endregion
 
         #region starts with