diff --git a/Program.cs b/Program.cs
new file mode 100644
index 0000000..13a2e11
--- /dev/null
+++ b/Program.cs
@@ -0,0 +1,3 @@
+using Programmation_objet_TLESIO21.TD1;
+
+Td1.Launch();
diff --git a/Programmation objet TLESIO21.csproj b/Programmation objet TLESIO21.csproj
new file mode 100644
index 0000000..c526893
--- /dev/null
+++ b/Programmation objet TLESIO21.csproj	
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>Programmation_objet_TLESIO21</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>
diff --git a/Programmation objet TLESIO21.sln b/Programmation objet TLESIO21.sln
new file mode 100644
index 0000000..6e8f3ac
--- /dev/null
+++ b/Programmation objet TLESIO21.sln	
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.3.32825.248
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Programmation objet TLESIO21", "Programmation objet TLESIO21.csproj", "{934A555A-9646-4CD6-8C66-58A6082B4700}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{934A555A-9646-4CD6-8C66-58A6082B4700}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{934A555A-9646-4CD6-8C66-58A6082B4700}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{934A555A-9646-4CD6-8C66-58A6082B4700}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{934A555A-9646-4CD6-8C66-58A6082B4700}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {C38246C9-46A0-467B-AC5C-0DC635D2DDC5}
+	EndGlobalSection
+EndGlobal
diff --git a/TD1/td1.cs b/TD1/td1.cs
new file mode 100644
index 0000000..ee09564
--- /dev/null
+++ b/TD1/td1.cs
@@ -0,0 +1,31 @@
+using System;
+
+namespace Programmation_objet_TLESIO21.TD1 {
+    public static class Td1 {
+
+        private static void Excercice1(ref int a, ref int b) {
+            (a, b) = (b, a);
+        }
+
+        private static void TestExcercice1() {
+            Console.Write("Saisir a : ");
+            String s = Console.ReadLine();
+            int a = int.Parse(s);
+
+            Console.Write("Saisir b : ");
+            s = Console.ReadLine();
+            int b = int.Parse(s);
+
+
+            Console.WriteLine("Avant inversion, a = " + a + " & b = " + b);
+            Excercice1(ref a, ref b);
+            Console.WriteLine("Après inversion, a = " + a + " & b = " + b);
+        }
+
+        public static void Launch() {
+            TestExcercice1();
+        }
+
+
+    }
+}
diff --git a/pdf/CM/Cours1C#.pdf b/pdf/CM/Cours1C#.pdf
new file mode 100644
index 0000000..9e8f24b
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diff --git a/pdf/TD/TD1.pdf b/pdf/TD/TD1.pdf
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index 0000000..c12b222
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