How to output in textbox with ASCII characters?

Question

C++ / C#

for (int i=0; i<n2; i++) // перевод в тип char зашифрованных данных
        cod[i]=char(codtext[i]);
textBox4->Text = gcnew System::String(cod, 0, n2);

Here is part of the code. The problem is that unicode characters are displayed in the textbox (if I'm not mistaken), and I only need ASCII. I'm using Visual Srudio 2012. What can I do?
PS The codtext array contains numbers in the range from 0 to 255.

Answer 1

char ascii[255];
std::string result; // #include <string>
for(int i = 0; i < 255; i++)
{
  ascii[i] = i;
  result.append(ascii[i]);
}
textBox4->Text = result;

PS What is it, Visual C++?