diff --git a/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp.Benchmark/DefaultValueFromDictionaryInCSharp.Benchmark.csproj b/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp.Benchmark/DefaultValueFromDictionaryInCSharp.Benchmark.csproj
index 04f03a0973..62be4f867f 100644
--- a/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp.Benchmark/DefaultValueFromDictionaryInCSharp.Benchmark.csproj
+++ b/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp.Benchmark/DefaultValueFromDictionaryInCSharp.Benchmark.csproj
@@ -2,13 +2,13 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.13.4" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.15.8" />
   </ItemGroup>
 
 </Project>
diff --git a/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp.csproj b/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp.csproj
index 4071f55782..dfb40caafc 100644
--- a/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp.csproj
+++ b/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp.csproj
@@ -2,14 +2,9 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
-  <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.13.4" />
-    <PackageReference Include="System.Collections" Version="4.3.0" />
-  </ItemGroup>
-
 </Project>
diff --git a/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Methods/MethodContainsKey.cs b/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Methods/MethodContainsKey.cs
index 676ba2b8a5..daf2f06cb5 100644
--- a/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Methods/MethodContainsKey.cs
+++ b/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Methods/MethodContainsKey.cs
@@ -2,7 +2,7 @@
 {
     public static class MethodContainsKey
     {
-        public static dynamic GetValueFromDictionary<T>(Dictionary<string, T> dictionary, string key)
+        public static T? GetValueFromDictionary<T>(Dictionary<string, T> dictionary, string key)
         {
             return dictionary.ContainsKey(key) ? dictionary[key] : default;
         }
diff --git a/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Methods/MethodGetValueOrDefault.cs b/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Methods/MethodGetValueOrDefault.cs
index 580a7c4072..77e6f4dc0c 100644
--- a/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Methods/MethodGetValueOrDefault.cs
+++ b/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Methods/MethodGetValueOrDefault.cs
@@ -2,7 +2,7 @@
 {
     public static class MethodGetValueOrDefault
     {
-        public static dynamic GetValueFromDictionary<T>(Dictionary<string, T> dictionary, string? key)
+        public static T? GetValueFromDictionary<T>(Dictionary<string, T> dictionary, string key)
         {
             return dictionary.GetValueOrDefault(key);
         }
diff --git a/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Methods/MethodGetValueOrDefaultWithFallback.cs b/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Methods/MethodGetValueOrDefaultWithFallback.cs
new file mode 100644
index 0000000000..5ea2fd22c5
--- /dev/null
+++ b/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Methods/MethodGetValueOrDefaultWithFallback.cs
@@ -0,0 +1,10 @@
+namespace DefaultValueFromDictionaryInCSharp.MethodGetValueOrDefaultWithFallback
+{
+    public static class MethodGetValueOrDefaultWithFallback
+    {
+        public static T GetValueFromDictionary<T>(Dictionary<string, T> dictionary, string key, T fallback)
+        {
+            return dictionary.GetValueOrDefault(key, fallback);
+        }
+    }
+}
diff --git a/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Methods/MethodTryGetValue.cs b/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Methods/MethodTryGetValue.cs
index 2c9b210886..a70a878d9c 100644
--- a/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Methods/MethodTryGetValue.cs
+++ b/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Methods/MethodTryGetValue.cs
@@ -2,7 +2,7 @@
 {
     public static class MethodTryGetValue
     {
-        public static dynamic? GetValueFromDictionary<T>(Dictionary<string, T> dictionary, string key)
+        public static T? GetValueFromDictionary<T>(Dictionary<string, T> dictionary, string key)
         {
             return dictionary.TryGetValue(key, out var value) ? value : default;
         }
diff --git a/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Program.cs b/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Program.cs
index a2cc90c2b5..453090710b 100644
--- a/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Program.cs
+++ b/collections-dictionary/DefaultValueFromDictionaryInCSharp/DefaultValueFromDictionaryInCSharp/Program.cs
@@ -1,5 +1,6 @@
 using DefaultValueFromDictionaryInCSharp.MethodContainsKey;
 using DefaultValueFromDictionaryInCSharp.MethodGetValueOrDefault;
+using DefaultValueFromDictionaryInCSharp.MethodGetValueOrDefaultWithFallback;
 using DefaultValueFromDictionaryInCSharp.MethodTryGetValue;
 
 var myDictionary = new Dictionary<string, int>
@@ -16,4 +17,6 @@
 
 Console.WriteLine($"{MethodGetValueOrDefault.GetValueFromDictionary(myDictionary, key)}");
 
+Console.WriteLine($"{MethodGetValueOrDefaultWithFallback.GetValueFromDictionary(myDictionary, key, -1)}");
+
 Console.ReadKey();
\ No newline at end of file
diff --git a/collections-dictionary/DefaultValueFromDictionaryInCSharp/Tests/DefaultValueFromDictionaryUnitTests.cs b/collections-dictionary/DefaultValueFromDictionaryInCSharp/Tests/DefaultValueFromDictionaryUnitTests.cs
index 8fed336f7b..7f7df6fae1 100644
--- a/collections-dictionary/DefaultValueFromDictionaryInCSharp/Tests/DefaultValueFromDictionaryUnitTests.cs
+++ b/collections-dictionary/DefaultValueFromDictionaryInCSharp/Tests/DefaultValueFromDictionaryUnitTests.cs
@@ -1,4 +1,7 @@
+using DefaultValueFromDictionaryInCSharp.MethodContainsKey;
 using DefaultValueFromDictionaryInCSharp.MethodGetValueOrDefault;
+using DefaultValueFromDictionaryInCSharp.MethodGetValueOrDefaultWithFallback;
+using DefaultValueFromDictionaryInCSharp.MethodTryGetValue;
 
 namespace Tests
 {
@@ -17,7 +20,7 @@ public void GivenMethodGetValueOrDefault_WhenKeyNotExisting_ThenDefaultValueZero
             var key = "sam";
             var value = MethodGetValueOrDefault.GetValueFromDictionary(_myDictionary, key);
 
-            Assert.AreEqual(value, 0);
+            Assert.AreEqual(0, value);
         }
 
         [TestMethod]
@@ -26,43 +29,77 @@ public void GivenMethodGetValueOrDefault_WhenKeyBob_ThenValueTwo()
             var key = "bob";
             var value = MethodGetValueOrDefault.GetValueFromDictionary(_myDictionary, key);
 
-            Assert.AreEqual(value, 2);
+            Assert.AreEqual(2, value);
         }
 
         [TestMethod]
         public void GivenMethodTryGetValue_WhenKeyNotExisting_ThenDefaultValueZero()
         {
             var key = "sam";
-            var value = MethodGetValueOrDefault.GetValueFromDictionary(_myDictionary, key);
+            var value = MethodTryGetValue.GetValueFromDictionary(_myDictionary, key);
 
-            Assert.AreEqual(value, 0);
+            Assert.AreEqual(0, value);
         }
 
         [TestMethod]
         public void GivenMethodTryGetValue_WhenKeyBob_ThenValueTwo()
         {
             var key = "bob";
-            var value = MethodGetValueOrDefault.GetValueFromDictionary(_myDictionary, key);
+            var value = MethodTryGetValue.GetValueFromDictionary(_myDictionary, key);
 
-            Assert.AreEqual(value, 2);
+            Assert.AreEqual(2, value);
         }
 
         [TestMethod]
         public void GivenMethodContainsKey_WhenKeyNotExisting_ThenDefaultValueZero()
         {
             var key = "sam";
-            var value = MethodGetValueOrDefault.GetValueFromDictionary(_myDictionary, key);
+            var value = MethodContainsKey.GetValueFromDictionary(_myDictionary, key);
 
-            Assert.AreEqual(value, 0);
+            Assert.AreEqual(0, value);
         }
 
         [TestMethod]
         public void GivenMethodContainsKey_WhenKeyBob_ThenValueTwo()
         {
             var key = "bob";
-            var value = MethodGetValueOrDefault.GetValueFromDictionary(_myDictionary, key);
+            var value = MethodContainsKey.GetValueFromDictionary(_myDictionary, key);
+
+            Assert.AreEqual(2, value);
+        }
+
+        [TestMethod]
+        public void GivenMethodGetValueOrDefaultWithFallback_WhenKeyNotExisting_ThenFallbackValue()
+        {
+            var key = "sam";
+            var value = MethodGetValueOrDefaultWithFallback.GetValueFromDictionary(_myDictionary, key, -1);
+
+            Assert.AreEqual(-1, value);
+        }
+
+        [TestMethod]
+        public void GivenMethodGetValueOrDefaultWithFallback_WhenStoredValueEqualsFallback_ThenSameResultAsMissingKey()
+        {
+            var dictionary = new Dictionary<string, int> { { "neg", -1 } };
+
+            var stored = MethodGetValueOrDefaultWithFallback.GetValueFromDictionary(dictionary, "neg", -1);
+            var missing = MethodGetValueOrDefaultWithFallback.GetValueFromDictionary(dictionary, "gone", -1);
+
+            Assert.AreEqual(-1, stored);
+            Assert.AreEqual(-1, missing);
+            Assert.AreEqual(stored, missing);
+        }
+
+        [TestMethod]
+        public void GivenFirstOrDefault_WhenKeyNotExisting_ThenDefaultKeyValuePairNotNull()
+        {
+            var searchKey = "sam";
+
+            var pair = _myDictionary.FirstOrDefault(p => p.Key == searchKey);
 
-            Assert.AreEqual(value, 2);
+            Assert.AreEqual(default(KeyValuePair<string, int>), pair);
+            Assert.IsNull(pair.Key);
+            Assert.AreEqual(0, pair.Value);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/collections-dictionary/DefaultValueFromDictionaryInCSharp/Tests/Tests.csproj b/collections-dictionary/DefaultValueFromDictionaryInCSharp/Tests/Tests.csproj
index d9bf2f63ea..3b65724ff8 100644
--- a/collections-dictionary/DefaultValueFromDictionaryInCSharp/Tests/Tests.csproj
+++ b/collections-dictionary/DefaultValueFromDictionaryInCSharp/Tests/Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
 
@@ -9,10 +9,10 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.2" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.2.10" />
-    <PackageReference Include="MSTest.TestFramework" Version="2.2.10" />
-    <PackageReference Include="coverlet.collector" Version="3.1.2" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.9.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="4.3.3" />
+    <PackageReference Include="MSTest.TestFramework" Version="4.3.3" />
+    <PackageReference Include="coverlet.collector" Version="10.0.1" />
   </ItemGroup>
 
   <ItemGroup>