How to add new line in a textBox

Hello Experts,
I am a complete beginner in C#. I am using the following "for loop" example to enter numbers in a textBox.  The example works fine except it displays the end of the loop in the box.
I need to have each digit displayed on a separate line.
Here is the code which is placed inside a button. The textBox1 property is set to multiline.


        private void button1_Click(object sender, EventArgs e)
            for (int intCounter = 1; intCounter <= 100; intCounter++)

                textBox1.Text = intCounter.ToString() + Environment.NewLine;

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Mike TomlinsonMiddle School Assistant TeacherCommented:
Change this line:

    textBox1.Text = intCounter.ToString() + Environment.NewLine;


    textBox1.Text = textBox1.Text + intCounter.ToString() + Environment.NewLine;


    textBox1.AppendText(intCounter.ToString() + Environment.NewLine);

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