diff --git a/Program.cs b/Program.cs
index 424d7fa..3c641c9 100644
--- a/Program.cs
+++ b/Program.cs
@@ -19,7 +19,7 @@ class Program {
                     break;
                 case 1:
                     Console.Clear();
-
+                    Console.WriteLine(TrovaESostituisci());
                     Pausa();
                     break;
                 case 2:
@@ -46,9 +46,29 @@ class Program {
         while (scelta != 0);
     }
 
-    static void Pausa(){
+    static void Pausa() {
         Console.WriteLine("Premere un tasto per continuare. . .");
         Console.ReadKey();
         Console.Clear();
     }
+
+    static string TrovaESostituisci() {
+        string daEsserCercato, trova, sostituisci, ritorno;
+        //Richiedo all'utente il testo in cui cercare, il testo da trovare e il testo con cui sostituire il testo trovato
+        Console.Write("Inserire il testo in cui cercare: ");
+        daEsserCercato = Console.ReadLine();
+        Console.Write("Inserire il testo da cercare: ");
+        trova = Console.ReadLine();
+        Console.Write("Inserire il testo da sostituire: ");
+        sostituisci = Console.ReadLine();
+
+        if (daEsserCercato.Contains(trova)) {
+            ritorno = daEsserCercato.Replace(trova, sostituisci);
+        }
+        else{
+            ritorno = $"Nessuna occorrenza di {trova} trovata in {daEsserCercato}";
+        }
+
+        return ritorno;
+    }
 }
diff --git a/bin/Debug/net9.0/strings_1 b/bin/Debug/net9.0/strings_1
new file mode 100755
index 0000000..d716707
Binary files /dev/null and b/bin/Debug/net9.0/strings_1 differ
diff --git a/bin/Debug/net9.0/strings_1.deps.json b/bin/Debug/net9.0/strings_1.deps.json
new file mode 100644
index 0000000..a509d07
--- /dev/null
+++ b/bin/Debug/net9.0/strings_1.deps.json
@@ -0,0 +1,23 @@
+{
+  "runtimeTarget": {
+    "name": ".NETCoreApp,Version=v9.0",
+    "signature": ""
+  },
+  "compilationOptions": {},
+  "targets": {
+    ".NETCoreApp,Version=v9.0": {
+      "strings_1/1.0.0": {
+        "runtime": {
+          "strings_1.dll": {}
+        }
+      }
+    }
+  },
+  "libraries": {
+    "strings_1/1.0.0": {
+      "type": "project",
+      "serviceable": false,
+      "sha512": ""
+    }
+  }
+}
\ No newline at end of file
diff --git a/bin/Debug/net9.0/strings_1.dll b/bin/Debug/net9.0/strings_1.dll
new file mode 100644
index 0000000..b545acf
Binary files /dev/null and b/bin/Debug/net9.0/strings_1.dll differ
diff --git a/bin/Debug/net9.0/strings_1.pdb b/bin/Debug/net9.0/strings_1.pdb
new file mode 100644
index 0000000..ea7a123
Binary files /dev/null and b/bin/Debug/net9.0/strings_1.pdb differ
diff --git a/bin/Debug/net9.0/strings_1.runtimeconfig.json b/bin/Debug/net9.0/strings_1.runtimeconfig.json
new file mode 100644
index 0000000..b19c3c8
--- /dev/null
+++ b/bin/Debug/net9.0/strings_1.runtimeconfig.json
@@ -0,0 +1,12 @@
+{
+  "runtimeOptions": {
+    "tfm": "net9.0",
+    "framework": {
+      "name": "Microsoft.NETCore.App",
+      "version": "9.0.0"
+    },
+    "configProperties": {
+      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": false
+    }
+  }
+}
\ No newline at end of file
diff --git a/obj/Debug/net9.0/apphost b/obj/Debug/net9.0/apphost
new file mode 100755
index 0000000..d716707
Binary files /dev/null and b/obj/Debug/net9.0/apphost differ
diff --git a/obj/Debug/net9.0/ref/strings_1.dll b/obj/Debug/net9.0/ref/strings_1.dll
new file mode 100644
index 0000000..719cf54
Binary files /dev/null and b/obj/Debug/net9.0/ref/strings_1.dll differ
diff --git a/obj/Debug/net9.0/refint/strings_1.dll b/obj/Debug/net9.0/refint/strings_1.dll
new file mode 100644
index 0000000..719cf54
Binary files /dev/null and b/obj/Debug/net9.0/refint/strings_1.dll differ
diff --git a/obj/Debug/net9.0/strings_1.AssemblyInfo.cs b/obj/Debug/net9.0/strings_1.AssemblyInfo.cs
index ceb7bb8..998e8c8 100644
--- a/obj/Debug/net9.0/strings_1.AssemblyInfo.cs
+++ b/obj/Debug/net9.0/strings_1.AssemblyInfo.cs
@@ -13,10 +13,10 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("strings_1")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+14ddf1dae3db729089bc25cbbbb7788a5f57dd92")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+0c0dba09f56a880aa213506f9e689c9f02f72bc4")]
 [assembly: System.Reflection.AssemblyProductAttribute("strings_1")]
 [assembly: System.Reflection.AssemblyTitleAttribute("strings_1")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
 
-// Generated by the MSBuild WriteCodeFragment class.
+// Generato dalla classe WriteCodeFragment di MSBuild.
 
diff --git a/obj/Debug/net9.0/strings_1.AssemblyInfoInputs.cache b/obj/Debug/net9.0/strings_1.AssemblyInfoInputs.cache
index 00b8f29..56977f2 100644
--- a/obj/Debug/net9.0/strings_1.AssemblyInfoInputs.cache
+++ b/obj/Debug/net9.0/strings_1.AssemblyInfoInputs.cache
@@ -1 +1 @@
-ee7f9dfff348a2f12e1a614efb59dd81290f3a39a048bfa56c88f777e98adb6e
+04a8bffd0985b606c02f47e14af099392fb8a67f7a6b726a8ce22dfe96827131
diff --git a/obj/Debug/net9.0/strings_1.csproj.CoreCompileInputs.cache b/obj/Debug/net9.0/strings_1.csproj.CoreCompileInputs.cache
new file mode 100644
index 0000000..7bdce7c
--- /dev/null
+++ b/obj/Debug/net9.0/strings_1.csproj.CoreCompileInputs.cache
@@ -0,0 +1 @@
+fb927268c7b1060217e4f7ad3a11ad8f810e3d610cb172113baec1dadeb516cb
diff --git a/obj/Debug/net9.0/strings_1.csproj.FileListAbsolute.txt b/obj/Debug/net9.0/strings_1.csproj.FileListAbsolute.txt
new file mode 100644
index 0000000..ed4028f
--- /dev/null
+++ b/obj/Debug/net9.0/strings_1.csproj.FileListAbsolute.txt
@@ -0,0 +1,14 @@
+/home/Verde/git/strings_1/bin/Debug/net9.0/strings_1
+/home/Verde/git/strings_1/bin/Debug/net9.0/strings_1.deps.json
+/home/Verde/git/strings_1/bin/Debug/net9.0/strings_1.runtimeconfig.json
+/home/Verde/git/strings_1/bin/Debug/net9.0/strings_1.dll
+/home/Verde/git/strings_1/bin/Debug/net9.0/strings_1.pdb
+/home/Verde/git/strings_1/obj/Debug/net9.0/strings_1.GeneratedMSBuildEditorConfig.editorconfig
+/home/Verde/git/strings_1/obj/Debug/net9.0/strings_1.AssemblyInfoInputs.cache
+/home/Verde/git/strings_1/obj/Debug/net9.0/strings_1.AssemblyInfo.cs
+/home/Verde/git/strings_1/obj/Debug/net9.0/strings_1.csproj.CoreCompileInputs.cache
+/home/Verde/git/strings_1/obj/Debug/net9.0/strings_1.dll
+/home/Verde/git/strings_1/obj/Debug/net9.0/refint/strings_1.dll
+/home/Verde/git/strings_1/obj/Debug/net9.0/strings_1.pdb
+/home/Verde/git/strings_1/obj/Debug/net9.0/strings_1.genruntimeconfig.cache
+/home/Verde/git/strings_1/obj/Debug/net9.0/ref/strings_1.dll
diff --git a/obj/Debug/net9.0/strings_1.dll b/obj/Debug/net9.0/strings_1.dll
new file mode 100644
index 0000000..b545acf
Binary files /dev/null and b/obj/Debug/net9.0/strings_1.dll differ
diff --git a/obj/Debug/net9.0/strings_1.genruntimeconfig.cache b/obj/Debug/net9.0/strings_1.genruntimeconfig.cache
new file mode 100644
index 0000000..b4258ec
--- /dev/null
+++ b/obj/Debug/net9.0/strings_1.genruntimeconfig.cache
@@ -0,0 +1 @@
+4ef0b4131b6d21f6f805d392a8983e9dd147fcb78ed55fd4d1215a826971cbb0
diff --git a/obj/Debug/net9.0/strings_1.pdb b/obj/Debug/net9.0/strings_1.pdb
new file mode 100644
index 0000000..ea7a123
Binary files /dev/null and b/obj/Debug/net9.0/strings_1.pdb differ