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();
}
}