[Solved] Index was outside the bounds of the array in my case

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I’m offering two solutions. The first formats the input as Pascal Case.

static void Main(string[] args)
{
    Console.WriteLine(ToCamelCase("camels-drink-LOTS-OF_WATER"));

    Console.ReadKey();
}

public static string ToCamelCase(string str)
{
    // This holds our output
    StringBuilder sb = new StringBuilder();

    // Step 1 - split input into array of words
    string[] res = str.Split(new char[] { '-', '_' }, System.StringSplitOptions.RemoveEmptyEntries);
            
    // Step 2 - loop through the array
    for (int i = 0; i < res.Length; i++)
    {
        // For each word,
        // change all of the letters to lowercase
        res[i] = res[i].ToLower();

        // Then change the first letter to uppercase
        char[] ch = res[i].ToCharArray();
        ch[0] = Char.ToUpper(ch[0]);

        // Finally, add the result to our output
        string c = new string(ch);
        sb.Append(c);
    }

    return sb.ToString();
}

The second formats as Camel Case – it contains additional logic to handle the first word in your input array.

static void Main(string[] args)
{
    Console.WriteLine(ToCamelCase("camels-drink-LOTS-OF_WATER"));

    Console.ReadKey();
}

public static string ToCamelCase(string str)
{
    // This holds our output
    StringBuilder sb = new StringBuilder();

    // Step 1 - split input into array of words
    string[] res = str.Split(new char[] { '-', '_' }, System.StringSplitOptions.RemoveEmptyEntries);
        
    // Step 2 - loop through the array
    for (int i = 0; i < res.Length; i++)
    {
        // For each word,
        // change all of the letters to lowercase
        res[i] = res[i].ToLower();

        // Then change the first letter to uppercase unless it's the first word
        char[] ch = res[i].ToCharArray();                

        if (i != 0)
        {
            ch[0] = Char.ToUpper(ch[0]);
        }

        // Finally, add the result to our output
        string c = new string(ch);
        sb.Append(c);
    }

    return sb.ToString();
}

Let me know in the comments if you need any more help.

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solved Index was outside the bounds of the array in my case