C# Textbox example

if (k == 0)
                {
                    textBox1.Text = "c" + Convert.ToString(k) + "; 
                    x0, y0, R = " + Convert.ToString(cir[k].x0) + ",\t" +
                Convert.ToString(cir[k].y0) + ",\t" + Convert.ToString(cir[k].Radius);
                    textBox2.Text = "c" + Convert.ToString(k) + "; 
                    a1, a2, f1, f2 = " + Convert.ToString(a1_Round[k]) +
                        ", " + Convert.ToString(a2_Round[k]) + ", " + Convert.ToString(f1_Round[k]) + ", " + Convert.ToString(f2_Round[k]);
                }
                else
                {
                    textBox1.Text += System.Environment.NewLine + "c" + Convert.ToString(k) + "; 
                    x0, y0, R = " + Convert.ToString(cir[k].x0) + ",\t" +
                Convert.ToString(cir[k].y0) + ",\t" + Convert.ToString(cir[k].Radius);
                    textBox2.Text += System.Environment.NewLine + "c" + Convert.ToString(k) + "; 
                    a1, a2, f1, f2 = " + Convert.ToString(a1_Round[k]) +
                        ", " + Convert.ToString(a2_Round[k]) + ", " + Convert.ToString(f1_Round[k]) + ", " + Convert.ToString(f2_Round[k]);
                }

test
for (int x = 0; x < 5; x++)
{
}

\t  ==> tap 삽입
System.Environment.NewLine ==> 새 줄로 시작