public Form1()
 {
     InitializeComponent();
     b = new BBS(long.Parse(textBox1.Text), long.Parse(textBox2.Text), long.Parse(textBox3.Text));
     textBox4.ScrollBars = ScrollBars.Vertical;
 }
 //set parametr
 private void button2_Click(object sender, EventArgs e)
 {
     b             = new BBS(long.Parse(textBox1.Text), long.Parse(textBox2.Text), long.Parse(textBox3.Text));
     textBox4.Text = "";
 }