diff --git a/August-LeetCoding-Challenge/03-Valid-Palindrome/Valid-Palindrome.cs b/August-LeetCoding-Challenge/03-Valid-Palindrome/Valid-Palindrome.cs
new file mode 100644
index 0000000..01a12ba
--- /dev/null
+++ b/August-LeetCoding-Challenge/03-Valid-Palindrome/Valid-Palindrome.cs
@@ -0,0 +1,20 @@
+public class Solution {
+    public bool IsPalindrome(string s) {
+        int begin = 0;
+        int end = s.Length-1;
+        while(begin <= end){
+            while(begin<=end && !Char.IsLetterOrDigit(s[begin])){
+                begin++;
+            }
+            while(begin<=end && !Char.IsLetterOrDigit(s[end])){
+                end--;
+            }
+            if(begin<=end && Char.ToLower(s[begin]) != Char.ToLower(s[end])){
+                return false;
+            }
+            begin++;
+            end--;
+        }
+        return true;
+    }
+}
diff --git a/README.md b/README.md
index 49d7088..0c945c4 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,6 @@
 
 https://leetcode.com
 
-
 ## August LeetCoding Challenge
 Click [here](https://leetcode.com/explore/challenge/card/august-leetcoding-challenge/) for problem descriptions.
 
@@ -10,6 +9,7 @@ Solutions in various programming languages are provided. Enjoy it.
 
 1. [Detect Capital](https://github.com/AlgoStudyGroup/Leetcode/tree/master/August-LeetCoding-Challenge/01-Detect-Capital)
 2. [Design HashSet](https://github.com/AlgoStudyGroup/Leetcode/tree/master/August-LeetCoding-Challenge/02-Design-HashSet)
+3. [Valid Palindrome](https://github.com/AlgoStudyGroup/Leetcode/tree/master/August-LeetCoding-Challenge/03-Valid-Palindrome)
 
 ## July LeetCoding Challenge
 Click [here](https://leetcode.com/explore/featured/card/july-leetcoding-challenge/) for problem descriptions.