diff --git a/1-two-sum/1-two-sum.cs b/1-two-sum/1-two-sum.cs
new file mode 100644
index 0000000..b31efae
--- /dev/null
+++ b/1-two-sum/1-two-sum.cs
@@ -0,0 +1,12 @@
+public class Solution {
+    public int[] TwoSum(int[] nums, int target) {
+        for (int i = 0; i < nums.Length; i++) {
+            for (int j = i + 1; j < nums.Length; j++) {
+                if (nums[i] + nums[j] == target) {
+                    return new int[] {i , j};
+                }
+            }
+        }
+        return null;
+    }
+}
\ No newline at end of file