diff --git a/solution/2300-2399/2391.Minimum Amount of Time to Collect Garbage/README.md b/solution/2300-2399/2391.Minimum Amount of Time to Collect Garbage/README.md
index 817f8fbc6cb69..797701b8ac2a0 100644
--- a/solution/2300-2399/2391.Minimum Amount of Time to Collect Garbage/README.md	
+++ b/solution/2300-2399/2391.Minimum Amount of Time to Collect Garbage/README.md	
@@ -365,6 +365,27 @@ impl Solution {
 }
 ```
 
+### **C#**
+
+```cs
+public class Solution {
+    public int GarbageCollection(string[] garbage, int[] travel) {
+        int len = garbage.Length;
+        int res = 0;
+        HashSet<char> s = new HashSet<char>();
+        for (int i = len - 1; i >= 0; i--) {
+            foreach (char ch in garbage[i].ToCharArray()) {
+                if (!s.Contains(ch))
+                    s.Add(ch);
+            }
+            res += garbage[i].Length;
+            res += i > 0 ? s.Count * travel[i - 1] : 0;
+        }
+        return res;
+    }
+}
+```
+
 ### **...**
 
 ```
diff --git a/solution/2300-2399/2391.Minimum Amount of Time to Collect Garbage/README_EN.md b/solution/2300-2399/2391.Minimum Amount of Time to Collect Garbage/README_EN.md
index d9a3dc8f2d49d..b631efb851fb2 100644
--- a/solution/2300-2399/2391.Minimum Amount of Time to Collect Garbage/README_EN.md	
+++ b/solution/2300-2399/2391.Minimum Amount of Time to Collect Garbage/README_EN.md	
@@ -346,6 +346,27 @@ impl Solution {
 }
 ```
 
+### **C#**
+
+```cs
+public class Solution {
+    public int GarbageCollection(string[] garbage, int[] travel) {
+        int len = garbage.Length;
+        int res = 0;
+        HashSet<char> s = new HashSet<char>();
+        for (int i = len - 1; i >= 0; i--) {
+            foreach (char ch in garbage[i].ToCharArray()) {
+                if (!s.Contains(ch))
+                    s.Add(ch);
+            }
+            res += garbage[i].Length;
+            res += i > 0 ? s.Count * travel[i - 1] : 0;
+        }
+        return res;
+    }
+}
+```
+
 ### **...**
 
 ```
diff --git a/solution/2300-2399/2391.Minimum Amount of Time to Collect Garbage/Solution.cs b/solution/2300-2399/2391.Minimum Amount of Time to Collect Garbage/Solution.cs
new file mode 100644
index 0000000000000..d6f56689f606f
--- /dev/null
+++ b/solution/2300-2399/2391.Minimum Amount of Time to Collect Garbage/Solution.cs	
@@ -0,0 +1,16 @@
+public class Solution {
+    public int GarbageCollection(string[] garbage, int[] travel) {
+        int len = garbage.Length;
+        int res = 0;
+        HashSet<char> s = new HashSet<char>();
+        for (int i = len - 1; i >= 0; i--) {
+            foreach (char ch in garbage[i].ToCharArray()) {
+                if (!s.Contains(ch))
+                    s.Add(ch);
+            }
+            res += garbage[i].Length;
+            res += i > 0 ? s.Count * travel[i - 1] : 0;
+        }
+        return res;
+    }
+}