diff --git a/code/aka4rKO.exe b/code/aka4rKO.exe
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+++ b/code/aka4rKO.exe
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+// C# implementation of recursive Binary Search 
+using System; 
+  
+class GFG 
+{ 
+    // Returns index of x if it is present in  
+    // arr[l..r], else return -1 
+    static int binarySearch(int []arr, int l,  
+                                  int r, int x) 
+    { 
+        if (r >= l) 
+        { 
+            int mid = l + (r - l)/2; 
+  
+            // If the element is present at the  
+            // middle itself 
+            if (arr[mid] == x) 
+                return mid; 
+  
+            // If element is smaller than mid, then  
+            // it can only be present in left subarray 
+            if (arr[mid] > x) 
+                return binarySearch(arr, l, mid-1, x); 
+  
+            // Else the element can only be present 
+            // in right subarray 
+            return binarySearch(arr, mid+1, r, x); 
+        } 
+  
+        // We reach here when element is not present 
+        // in array 
+        return -1; 
+    } 
+  
+    // Driver method to test above 
+    public static void Main() 
+    { 
+          
+        int []arr = {2, 3, 4, 10, 40}; 
+        int n = arr.Length; 
+        int x = 10; 
+          
+        int result = binarySearch(arr, 0, n-1, x); 
+          
+        if (result == -1) 
+            Console.WriteLine("Element not present"); 
+        else
+            Console.WriteLine("Element found at index " 
+                                             + result); 
+    } 
+} 
+  
+// This code is contributed by Sam007.