Printing from ListView to RAW Printer

private void PrintBill()
{
//Printing
//Locus.PMIS.Db.PMIS objPMIS = new Locus.PMIS.Db.PMIS();
string s = "";
//s += "\n"+Spaces(29," ")+objPMIS.GetServerDate().ToShortDateString()+"\n";
s += "Bill Number: "+txtBillNo.Text + "\n";
if (txtPatientName.Text.Trim().Length > 0)
s += "Issued To: " + txtPatientName.Text+"\n";
s += Spaces(39, "=");
s += "\n";
s += "Particulars" + Spaces(7, " ") + "|Qty" + "|Rate" + Spaces(3, " ") + "|Amount";
s += "\n";
s += Spaces(39, "-") + "\n";

//End of printing Master
int len = 0;
for (int i = 0; i < lvBillDetail.Items.Count; i++)
{
//For printing Details

len = lvBillDetail.Items[i].SubItems[2].Text.Length;
if (len < 18)
{
s += lvBillDetail.Items[i].SubItems[2].Text; //ItemName
s += Spaces(18 - len, " ");
}
else
{
s += lvBillDetail.Items[i].SubItems[2].Text.Substring(0, 16) + "-";
s += "\n";
s += lvBillDetail.Items[i].SubItems[2].Text.Substring(16, len-16);
s += Spaces((18 - lvBillDetail.Items[i].SubItems[2].Text.Substring(16, len-16).Length), " ");
}
s += "|";

len = lvBillDetail.Items[i].SubItems[4].Text.Trim().Length;
s += lvBillDetail.Items[i].SubItems[4].Text; //Quantity
s += Spaces(3 - len, " ");
s += "|";

len = lvBillDetail.Items[i].SubItems[3].Text.Trim().Length;
s += lvBillDetail.Items[i].SubItems[3].Text; //Rate
s += Spaces(7 - len, " ");
s += "|";

s += lvBillDetail.Items[i].SubItems[5].Text + "\n"; //Amount
}
s += Spaces(39, "-") + "\n";
s += Spaces(22," ")+"SubTotal|" + txtSubtotal.Text + "\n";
s += Spaces(22," ")+"Discount|" + txtDiscount.Text+"\n";
s += Spaces(19," ")+"Grand Total|" + lblGrandTotal.Text+"\n";
s += "\n"+"Cashier: " + ((mdiPharmacyModule)this.MdiParent).objEmployee.EmpName.ToString();
s += "\n" + Spaces(15, "=") + "Thank you" + Spaces(15, "=");
s += "\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n";
s += "\n" + Spaces(13, " ") + "My Print from ListView";// +Spaces(48, "");

objPrinter.SendStringToPrinter(printDocument1.PrinterSettings.PrinterName, s);

objPMIS.Close();
objPMIS.Dispose();
}
}