不知道怎样将光标转到指定行行首？

Question

richTextBox1.Select();
richTextBox1.SelectionStart = 0;

Answer 1

如果是textbox，设置TextBox.SelectionStart

Answer 2

c#怎样得到richtextbox中文本的总行数,？？？知道这个就能做出来了， 
下面的(parent.conrichctexttbox.Lines))不对，应该是总行数,可是我不知道怎样得到，帮帮忙啊，
  private void btngo_Click(object sender, EventArgs e)
        {
                string content = parent.conrichctexttbox.Text;
                string[] lines = content.Split('\n');
                //定位光标
                int n = Convert.ToInt32(this.txtgoto .Text);
                if (this.txtgoto.Text == "")
                {
                    MessageBox.Show("请输入要转到的行数！");                }
                else if (n >(int)( parent.conrichctexttbox.Lines))
                {
                    MessageBox.Show("大于总行数！请重新输入！！", "出错");
                   this.txtgoto.Text = "";                }
                int s = 0;
                for (int i = 0; i < (n - 2); i++)
                {
                    s = s + lines[i].Length;
                }
                parent.conrichctexttbox.Focus();
                parent.conrichctexttbox.Select(s + 1, 0);
                this.Close();
        }       
} 
    }

Answer 3

int totalLines= richTextBox1.GetLineFromCharIndex(richTextBox1.Text.Length - 1)+1;
Console.WriteLine("max:"+maxLine);