使用c#在字符串中大写单词

using System;

class Program
{
    static void Main(string[] args)
    {
        string input = "this is a sample string";
        string[] words = input.Split(' ');

        for (int i = 0; i < words.Length; i++)
        {
            if (char.IsLower(words[i][0]))
            {
                words[i] = char.ToUpper(words[i][0]) + words[i].Substring(1);
            }
        }

        string result = string.Join(" ", words);
        Console.WriteLine(result);
    }
}