Reversing a String and Checking for Palindromes

In this lesson you will learn how to reverse a string in C# and check whether it is a palindrome, covering the basics of string manipulation. This is for anyone searching for "C# reverse string palindrome check".

.Reverse() flips the order of the characters. A string that reads the same forwards and backwards is called a palindrome.

The sample code reverses the characters with s.Reverse().ToArray() inside IsPalindrome(), turns them back into a string with new string(...), and compares with the original s. "racecar" comes out the same either way, so it is reported as a palindrome.

A common stumbling block for beginners is that .Reverse() returns a sequence of characters. You need the new string() constructor to turn it back into a string, and forgetting that gives a compile error.

This is one of the simple, readable idioms you get from C# treating a string as a sequence of characters. StringBuilder is available too when you need to concatenate large amounts of text efficiently.

📖 Reference code

bool IsPalindrome(string s) {
    string reversed = new string(s.Reverse().ToArray());
    return s == reversed;
}

Console.WriteLine(IsPalindrome("racecar"));
Console.WriteLine(IsPalindrome("hello"));

✍️ Your code

Type your code, then press "Run"

🧪 This site can't compile or run C# directly, so it checks on the spot whether what you typed matches the reference code (scoring happens entirely in your browser — nothing is sent anywhere).