diff --git a/StringProcessingApp/Program.cs b/StringProcessingApp/Program.cs
new file mode 100644
index 0000000..bcbb9dc
--- /dev/null
+++ b/StringProcessingApp/Program.cs
@@ -0,0 +1,10 @@
+using StringProcessingApp.Views;
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        StringView view = new StringView();
+        view.Run();
+    }
+}
diff --git a/StringProcessingApp/Services/StringService.cs b/StringProcessingApp/Services/StringService.cs
new file mode 100644
index 0000000..bd67863
--- /dev/null
+++ b/StringProcessingApp/Services/StringService.cs
@@ -0,0 +1,40 @@
+namespace StringProcessingApp.Services
+{
+    public class StringService
+    {
+        private string originalText = "";
+        private string currentText = "";
+
+        public void SetText(string text)
+        {
+            originalText = text;
+            currentText = text;
+        }
+
+        public string GetCurrentText() => currentText;
+
+        public string ToUpperCase() => currentText = currentText.ToUpper();
+
+        public string ToLowerCase() => currentText = currentText.ToLower();
+
+        public int CountCharacters() => currentText.Length;
+
+        public bool ContainsWord(string word) => currentText.Contains(word);
+
+        public string ReplaceWord(string oldWord, string newWord)
+            => currentText = currentText.Replace(oldWord, newWord);
+
+        public string ExtractSubstring(int startIndex, int length)
+            => currentText.Substring(startIndex, length);
+
+        public string TrimSpaces() => currentText = currentText.Trim();
+
+        public string ResetText()
+        {
+            currentText = originalText;
+            return currentText;
+        }
+
+        public bool HasText() => !string.IsNullOrEmpty(currentText);
+    }
+}
diff --git a/StringProcessingApp/Views/StringView.cs b/StringProcessingApp/Views/StringView.cs
new file mode 100644
index 0000000..8472a96
--- /dev/null
+++ b/StringProcessingApp/Views/StringView.cs
@@ -0,0 +1,180 @@
+using StringProcessingApp.Services;
+
+namespace StringProcessingApp.Views
+{
+    public class StringView
+    {
+        private readonly StringService _service = new StringService();
+
+        public void Run()
+        {
+            bool running = true;
+
+            while (running)
+            {
+                DisplayMenu();
+                Console.Write("Choose an option: ");
+                string? choice = Console.ReadLine();
+
+                Console.WriteLine();
+
+                switch (choice)
+                {
+                    case "1":
+                        EnterText();
+                        break;
+                    case "2":
+                        ViewCurrentText();
+                        break;
+                    case "3":
+                        ConvertToUpper();
+                        break;
+                    case "4":
+                        ConvertToLower();
+                        break;
+                    case "5":
+                        CountCharacters();
+                        break;
+                    case "6":
+                        CheckContains();
+                        break;
+                    case "7":
+                        ReplaceWord();
+                        break;
+                    case "8":
+                        ExtractSubstring();
+                        break;
+                    case "9":
+                        TrimSpaces();
+                        break;
+                    case "10":
+                        ResetText();
+                        break;
+                    case "11":
+                        running = false;
+                        Console.WriteLine("Goodbye!");
+                        break;
+                    default:
+                        Console.WriteLine("Invalid option. Please try again.");
+                        break;
+                }
+
+                Console.WriteLine();
+            }
+        }
+
+        private void DisplayMenu()
+        {
+            Console.WriteLine("=============================");
+            Console.WriteLine("   STRING PROCESSING SYSTEM  ");
+            Console.WriteLine("=============================");
+            Console.WriteLine("1.  Enter Text");
+            Console.WriteLine("2.  View Current Text");
+            Console.WriteLine("3.  Convert to UPPERCASE");
+            Console.WriteLine("4.  Convert to lowercase");
+            Console.WriteLine("5.  Count Characters");
+            Console.WriteLine("6.  Check if Contains Word");
+            Console.WriteLine("7.  Replace Word");
+            Console.WriteLine("8.  Extract Substring");
+            Console.WriteLine("9.  Trim Spaces");
+            Console.WriteLine("10. Reset Text");
+            Console.WriteLine("11. Exit");
+            Console.WriteLine("=============================");
+        }
+
+        private void EnterText()
+        {
+            Console.Write("Enter your text: ");
+            string? input = Console.ReadLine();
+            if (!string.IsNullOrEmpty(input))
+            {
+                _service.SetText(input);
+                Console.WriteLine("Text saved successfully!");
+            }
+            else
+            {
+                Console.WriteLine("No text entered.");
+            }
+        }
+
+        private void ViewCurrentText()
+        {
+            if (!_service.HasText())
+                Console.WriteLine("No text entered yet.");
+            else
+                Console.WriteLine($"Current Text: \"{_service.GetCurrentText()}\"");
+        }
+
+        private void ConvertToUpper()
+        {
+            if (!_service.HasText()) { Console.WriteLine("Please enter text first."); return; }
+            Console.WriteLine($"UPPERCASE: \"{_service.ToUpperCase()}\"");
+        }
+
+        private void ConvertToLower()
+        {
+            if (!_service.HasText()) { Console.WriteLine("Please enter text first."); return; }
+            Console.WriteLine($"lowercase: \"{_service.ToLowerCase()}\"");
+        }
+
+        private void CountCharacters()
+        {
+            if (!_service.HasText()) { Console.WriteLine("Please enter text first."); return; }
+            Console.WriteLine($"Character Count: {_service.CountCharacters()}");
+        }
+
+        private void CheckContains()
+        {
+            if (!_service.HasText()) { Console.WriteLine("Please enter text first."); return; }
+            Console.Write("Enter word to search: ");
+            string? word = Console.ReadLine();
+            if (string.IsNullOrEmpty(word)) { Console.WriteLine("No word entered."); return; }
+            bool found = _service.ContainsWord(word);
+            Console.WriteLine(found
+                ? $"✓ The text contains \"{word}\"."
+                : $"✗ The text does NOT contain \"{word}\".");
+        }
+
+        private void ReplaceWord()
+        {
+            if (!_service.HasText()) { Console.WriteLine("Please enter text first."); return; }
+            Console.Write("Enter word to replace: ");
+            string? oldWord = Console.ReadLine();
+            Console.Write("Enter new word: ");
+            string? newWord = Console.ReadLine();
+            if (string.IsNullOrEmpty(oldWord) || newWord == null) { Console.WriteLine("Invalid input."); return; }
+            Console.WriteLine($"Result: \"{_service.ReplaceWord(oldWord, newWord)}\"");
+        }
+
+        private void ExtractSubstring()
+        {
+            if (!_service.HasText()) { Console.WriteLine("Please enter text first."); return; }
+            Console.WriteLine($"Current Text: \"{_service.GetCurrentText()}\" (Length: {_service.CountCharacters()})");
+            Console.Write("Enter start index: ");
+            if (!int.TryParse(Console.ReadLine(), out int start)) { Console.WriteLine("Invalid index."); return; }
+            Console.Write("Enter length: ");
+            if (!int.TryParse(Console.ReadLine(), out int length)) { Console.WriteLine("Invalid length."); return; }
+
+            try
+            {
+                Console.WriteLine($"Substring: \"{_service.ExtractSubstring(start, length)}\"");
+            }
+            catch (ArgumentOutOfRangeException)
+            {
+                Console.WriteLine("Error: Index or length is out of range.");
+            }
+        }
+
+        private void TrimSpaces()
+        {
+            if (!_service.HasText()) { Console.WriteLine("Please enter text first."); return; }
+            Console.WriteLine($"Trimmed: \"{_service.TrimSpaces()}\"");
+        }
+
+        private void ResetText()
+        {
+            if (!_service.HasText()) { Console.WriteLine("Please enter text first."); return; }
+            Console.WriteLine($"Text reset to: \"{_service.ResetText()}\"");
+        }
+    }
+}