Class asdjkfj
{
  string autoSavePrefix = ""; 
  ...
private void btnSave1_Click(object sender, EventArgs e)
        {
            StreamWriter write1 = new StreamWriter 
            ( "C:\\" + autoSavePrefix + txtSaveName.Text );
 
            write1.WriteLine(txtfield1.Text);
            write1.WriteLine(txtfield2.Text);
            write1.WriteLine(txtfield3.Text);
 
            write1.Close();
         }
....
private void timer_Tick(object sender, EventArgs e)
     {
            DateTime autosave = DateTime.Today;
            if (txtSaveName.Visible == true)
            {
                autoSavePrefix = "Auto Saved";
                btnSave1_Click(null, null);
                autoSavePrefix = "";
            }
      }