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private void Form1_Load(object sender, EventArgs e)
{
this.textBox1.Multiline = true;
this.textBox1.Height = 400;
this.textBox1.Text = "aa\r\nbb\r\n";
this.textBox1.AppendText("cc" + Environment.NewLine);
this.textBox1.AppendText("dd" + Environment.NewLine);
}