diff --git a/OCP/IDevice.cs b/OCP/IDevice.cs
new file mode 100644
index 0000000..45944b6
--- /dev/null
+++ b/OCP/IDevice.cs
@@ -0,0 +1,7 @@
+namespace ElectronicDevices
+{
+    public interface IDevice
+    {
+        void DisplayDetails();
+    }
+}
diff --git a/OCP/IDeviceFactory.cs b/OCP/IDeviceFactory.cs
new file mode 100644
index 0000000..866afd7
--- /dev/null
+++ b/OCP/IDeviceFactory.cs
@@ -0,0 +1,7 @@
+namespace ElectronicDevices
+{
+    public interface IDeviceFactory
+    {
+        IDevice CreateDevice();
+    }
+}
diff --git a/OCP/Laptop.cs b/OCP/Laptop.cs
new file mode 100644
index 0000000..9068e01
--- /dev/null
+++ b/OCP/Laptop.cs
@@ -0,0 +1,10 @@
+namespace ElectronicDevices
+{
+    public class Laptop : IDevice
+    {
+        public void DisplayDetails()
+        {
+            Console.WriteLine("Laptop: Model Y, RAM: 16GB, Storage: 512GB");
+        }
+    }
+}
diff --git a/OCP/LaptopFactory.cs b/OCP/LaptopFactory.cs
new file mode 100644
index 0000000..24bcee6
--- /dev/null
+++ b/OCP/LaptopFactory.cs
@@ -0,0 +1,10 @@
+namespace ElectronicDevices
+{
+    public class LaptopFactory : IDeviceFactory
+    {
+        public IDevice CreateDevice()
+        {
+            return new Laptop();
+        }
+    }
+}
diff --git a/OCP/Program.cs b/OCP/Program.cs
new file mode 100644
index 0000000..e506171
--- /dev/null
+++ b/OCP/Program.cs
@@ -0,0 +1,17 @@
+namespace ElectronicDevices
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            IDeviceFactory smartphoneFactory = new SmartphoneFactory();
+            IDeviceFactory laptopFactory = new LaptopFactory();
+
+            IDevice smartphone = smartphoneFactory.CreateDevice();
+            IDevice laptop = laptopFactory.CreateDevice();
+
+            smartphone.DisplayDetails();
+            laptop.DisplayDetails();
+        }
+    }
+}
diff --git a/OCP/Smartphone.cs b/OCP/Smartphone.cs
new file mode 100644
index 0000000..8fe83e1
--- /dev/null
+++ b/OCP/Smartphone.cs
@@ -0,0 +1,10 @@
+namespace ElectronicDevices
+{
+    public class Smartphone : IDevice
+    {
+        public void DisplayDetails()
+        {
+            Console.WriteLine("Smartphone: Model X, RAM: 8GB, Storage: 128GB");
+        }
+    }
+}
diff --git a/OCP/SmartphoneFactory.cs b/OCP/SmartphoneFactory.cs
new file mode 100644
index 0000000..e875907
--- /dev/null
+++ b/OCP/SmartphoneFactory.cs
@@ -0,0 +1,10 @@
+namespace ElectronicDevices
+{
+    public class SmartphoneFactory : IDeviceFactory
+    {
+        public IDevice CreateDevice()
+        {
+            return new Smartphone();
+        }
+    }
+}
diff --git a/SRP/Example1/Printer.cs b/SRP/Example1/Printer.cs
new file mode 100644
index 0000000..ee70e30
--- /dev/null
+++ b/SRP/Example1/Printer.cs
@@ -0,0 +1,10 @@
+namespace RectangleAreaCalculator
+{
+    public class Printer
+    {
+        public void PrintArea(double area)
+        {
+            Console.WriteLine($"Area: {area}");
+        }
+    }
+}
diff --git a/SRP/Example1/Program.cs b/SRP/Example1/Program.cs
new file mode 100644
index 0000000..5e9696a
--- /dev/null
+++ b/SRP/Example1/Program.cs
@@ -0,0 +1,15 @@
+namespace RectangleAreaCalculator
+{
+    public class Program
+    {
+        static void Main()
+        {
+            Rectangle rectangle = new Rectangle(5.0, 3.0);
+            
+            double area = rectangle.CalculateArea();
+
+            Printer printer = new Printer();
+            printer.PrintArea(area);
+        }
+    }
+}
diff --git a/SRP/Example1/Rectangle.cs b/SRP/Example1/Rectangle.cs
new file mode 100644
index 0000000..52e0cd9
--- /dev/null
+++ b/SRP/Example1/Rectangle.cs
@@ -0,0 +1,19 @@
+namespace RectangleAreaCalculator
+{
+    public class Rectangle
+    {
+        public double Length { get; }
+        public double Width { get; }
+
+        public Rectangle(double length, double width)
+        {
+            Length = length;
+            Width = width;
+        }
+
+        public double CalculateArea()
+        {
+            return Length * Width;
+        }
+    }
+}
diff --git a/SRP/Example2/FileWriter.cs b/SRP/Example2/FileWriter.cs
new file mode 100644
index 0000000..a48150f
--- /dev/null
+++ b/SRP/Example2/FileWriter.cs
@@ -0,0 +1,17 @@
+namespace RectangleAreaApplication
+{
+    public class FileWriter
+    {
+        public static void WriteToFile(string fileName, string content)
+        {
+            try
+            {
+                File.WriteAllText(fileName, content);
+            }
+            catch (IOException exception)
+            {
+                Console.WriteLine("Error writing to file: " + exception.Message);
+            }
+        }
+    }
+}
diff --git a/SRP/Example2/Program.cs b/SRP/Example2/Program.cs
new file mode 100644
index 0000000..353b76c
--- /dev/null
+++ b/SRP/Example2/Program.cs
@@ -0,0 +1,15 @@
+namespace RectangleAreaApplication
+{
+    public class Program
+    {
+        static void Main(string[] args)
+        {
+            Rectangle rectangle = new Rectangle(5.0, 3.0);
+            double area = rectangle.CalculateArea();
+
+            FileWriter.WriteToFile("area.txt", $"Area: {area}");
+
+            Console.WriteLine($"Calculated Area: {area}");
+        }
+    }
+}
diff --git a/SRP/Example2/Rectangle.cs b/SRP/Example2/Rectangle.cs
new file mode 100644
index 0000000..62d1d05
--- /dev/null
+++ b/SRP/Example2/Rectangle.cs
@@ -0,0 +1,19 @@
+namespace RectangleAreaApplication
+{
+    public class Rectangle
+    {
+        private double length;
+        private double width;
+
+        public Rectangle(double length, double width)
+        {
+            this.length = length;
+            this.width = width;
+        }
+
+        public double CalculateArea()
+        {
+            return length * width;
+        }
+    }
+}