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diff --git a/C#/RangeOfElements.cs b/C#/RangeOfElements.cs
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+/* Impliment a method that will determine if there exists a range of non-negative elements in an array that sum up to a specific non-negative number
+
+    Example 1 - targetSum = 3, numbers = [1, 7, 1, 1 ,1, 5, 6, 1] - output true (the sum of the elemtns in range 2 to 4 is 3)
+    Example 2 - targetSum = 7, numbers = [0, 4, 5, 1, 8, 9, 12, 3, 1] - output false (no range sums to 7)
+*/
+
+using System;
+
+namespace Solution {
+    class MainClass {
+        public static void Main(string[] args) {
+            /* Note: this implementation also accounts for these edge cases:
+             *       target = 10, arr = { 1, 1, 1, 1 }
+             *       target =  4, arr = { 10, 9, 8, 6, 5, 4 }
+             */
+             
+            int[] arr = { 1, 7, 1, 1 ,1, 5, 6, 1 };
+            int target = 3;
+            Console.WriteLine(ContainsSubArray(arr, target));
+        }
+
+        private static bool ContainsSubArray(int[] arr, int target) {
+            int startIndex = 0, endIndex = 0;
+            int tmpSum = arr[0];
+
+            while (endIndex < arr.Length) {
+                if (tmpSum == target) {
+                    return true;
+                }
+                else if (tmpSum > target) {
+                    tmpSum -= arr[startIndex++];
+                }
+                else if (++endIndex < arr.Length) {
+                    tmpSum += arr[endIndex];
+                }
+            }
+
+            return false;
+        }
+    }
+}