How to display data from variables in richtextbox while working on the application?

Question

C++ / C#

In general, the question is of the following nature, it is necessary that the data from the variable be logged into the rich textbox.
Some example:

for (int i = 0; i < 85; i++)
            {
                string log = "Шаг номер: " + i;
                richTextBox1.Text += log.ToString() + Environment.NewLine;
            }

The code is processed, but it is displayed only after the entire program has been completed, and I need it to record all iterations during operation.

Answer 1

for (int i = 0; i < 85; i++)
{
string log = "Step number: " + i;
richTextBox1.Text += log.ToString() + Environment.NewLine;
Application.DoEvents();
}