Letter Capitalize

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Challenge

Using the C# language, have the function  LetterCapitalize(str) take the  str parameter being passed and capitalize the first letter of each word. Words will be separated by only one space. 

Sample Test Cases

Input:"hello world"

Output:"Hello World"

Input:"i ran there"

Output:"I Ran There"

Letter Capitalize算法 大写字符串中的每个单词首字母，单词用空格隔开

        public static string LetterCapitalize(string str)
        {
            char[] chArray = str.ToArray();
            int length = chArray.Length;
            char ch = '\0';
            bool IsFirstLetter = true;

            for (int i = 0; i < length; i++)
            {
                ch = chArray[i];

                if ((ch >= 'a' && ch <= 'z'))
                {
                    if (IsFirstLetter)
                    {
                        ch = (char)(ch - 32);
                        IsFirstLetter = false;
                    }
                }
                else if ((ch >= 'A' && ch <= 'Z'))
                {
                    if (IsFirstLetter)
                    {
                        IsFirstLetter = false;
                    }
                }
                else if (ch == ' ')
                {
                    IsFirstLetter = true;
                }
                chArray[i] = ch;
            }
            str = new string(chArray);
            return str;
        }