diff --git a/NumberGuessingGame/NumberGuessingGame.csproj b/NumberGuessingGame/NumberGuessingGame.csproj
new file mode 100644
index 0000000..fd4bd08
--- /dev/null
+++ b/NumberGuessingGame/NumberGuessingGame.csproj
@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>
diff --git a/NumberGuessingGame/Program.cs b/NumberGuessingGame/Program.cs
new file mode 100644
index 0000000..fbdf02f
--- /dev/null
+++ b/NumberGuessingGame/Program.cs
@@ -0,0 +1,38 @@
+namespace NumberGuessingGame
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Number Guessing Game: ");
+
+            const int targetNumber = 21;
+            int userGuess;
+
+            do
+            {
+                Console.Write("Guess a number between 1 and 100: ");
+
+                if (int.TryParse(Console.ReadLine(), out userGuess))
+                {
+                    if (userGuess > targetNumber)
+                    {
+                        Console.WriteLine("Too high! Try again.\n");
+                    }
+                    else if (userGuess < targetNumber)
+                    {
+                        Console.WriteLine("Too low! Try again.\n");
+                    }
+                }
+                else
+                {
+                    Console.WriteLine("Invalid input! Please enter a valid whole number.\n");
+                    userGuess = -1; 
+                }
+
+            } while (userGuess != targetNumber); 
+
+            Console.WriteLine("Congratulations! You guessed the correct number: {targetNumber}");
+        }
+    }
+}
diff --git a/SumOfDigitsWhile/Program.cs b/SumOfDigitsWhile/Program.cs
new file mode 100644
index 0000000..5a69588
--- /dev/null
+++ b/SumOfDigitsWhile/Program.cs
@@ -0,0 +1,42 @@
+namespace SumOfDigitsWhile
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+
+            Console.Write("Enter a multi-digit number (e.g., 123): ");
+
+            if (int.TryParse(Console.ReadLine(), out int inputNumber))
+            {
+               
+                int originalNumber = inputNumber;
+
+                
+                int currentNumber = Math.Abs(inputNumber);
+
+                int sumOfDigits = 0;
+
+              
+                while (currentNumber > 0)
+                {
+                  
+                    int lastDigit = currentNumber % 10;
+
+                    
+                    sumOfDigits += lastDigit;
+
+                    
+                    currentNumber = currentNumber / 10;
+                }
+
+                
+                Console.WriteLine($"\nThe sum of the digits in {originalNumber} is: {sumOfDigits}");
+            }
+            else
+            {
+                Console.WriteLine("Invalid input! Please enter a valid whole integer.");
+            }
+        }
+    }
+}
diff --git a/SumOfDigitsWhile/SumOfDigitsWhile.csproj b/SumOfDigitsWhile/SumOfDigitsWhile.csproj
new file mode 100644
index 0000000..fd4bd08
--- /dev/null
+++ b/SumOfDigitsWhile/SumOfDigitsWhile.csproj
@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>