checkPalindrome.cs

internal string isPalindrome(string str)
{
    bool flag = false;
    if (!string.IsNullOrEmpty(str))
    {
        for (int i = 0, j = str.Length -1; i < str.Length /2; i++, j--)
        {
            if (str[i] != str[j])
            {
                flag = false;
                break;
            }
            else 
                flag = true;
        }
    }
    return flag ? "Palindrome" : "Not Palindrome";
}