Save File in .Net Window Application

private void button1_Click(object sender, EventArgs e)
       {
        SaveFileDialog ss = new SaveFileDialog();
           ss.Filter = "Text File(.txt)|*.txt";
           ss.ShowDialog();
           if(ss.FileName !="")
           {
        StreamWriter sw = new StreamWriter(ss.FileName);
               sw.WriteLine(textBox1.Text);
                 sw.WriteLine(textBox2.Text);
                    sw.WriteLine(textBox3.Text);
               sw.Close();
           }
       }