cahr* m = textBox1->Text->ToCharArray();

using System;

public class StringSplit2 {
    public static void Main() {

        string delimStr = " ,.:";
        char [] delimiter = delimStr.ToCharArray();
        string words = "one two,three:four.";
        string [] split = null;

    Console.WriteLine("The delimiters are -{0}-", delimStr);
    for (int x = 1; x <= 5; x++) {
        split = words.Split(delimiter, x);
            Console.WriteLine("\ncount = {0,2} ..............", x);
        foreach (string s in split) {
                Console.WriteLine("-{0}-", s);
              }
    }
    }
}

array<String^>^str;

char* s = delimStr.ToCharArray()

char* s = delimStr->ToCharArray()

#include < stdio.h >
#include < stdlib.h >
#include < vcclr.h >

String ^str = textBox1->Text->ToString();
pin_ptr<const wchar_t> wch = PtrToStringChars(str);
size_t convertedChars = 0;
size_t  sizeInBytes = ((str->Length + 1) * 2);
errno_t err = 0;
char    *ch = (char *)malloc(sizeInBytes);

err = wcstombs_s(&convertedChars,
                    ch, sizeInBytes,
                    wch, sizeInBytes);
if (err != 0)
      printf_s("wcstombs_s  failed!\n");