diff --git a/problems/0435.无重叠区间.md b/problems/0435.无重叠区间.md
index c307532e..1a33f98e 100644
--- a/problems/0435.无重叠区间.md
+++ b/problems/0435.无重叠区间.md
@@ -441,6 +441,27 @@ impl Solution {
     }
 }
 ```
+### C#
+```csharp
+public class Solution
+{
+    public int EraseOverlapIntervals(int[][] intervals)
+    {
+        if (intervals.Length == 0) return 0;
+        Array.Sort(intervals, (a, b) => a[1].CompareTo(b[1]));
+        int res = 1, end = intervals[0][1];
+        for (int i = 1; i < intervals.Length; i++)
+        {
+            if (end <= intervals[i][0])
+            {
+                end = intervals[i][1];
+                res++;
+            }
+        }
+        return intervals.Length - res;
+    }
+}
+```
 
 
 <p align="center">