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();
}
}

Printing RAW data in .Net

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Runtime.InteropServices;

public class clsDipendrazPrintingEngine
{
// Structure and API declarions:
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public class DOCINFOA
{
[MarshalAs(UnmanagedType.LPStr)]
public string pDocName;
[MarshalAs(UnmanagedType.LPStr)]
public string pOutputFile;
[MarshalAs(UnmanagedType.LPStr)]
public string pDataType;
}
[DllImport("winspool.Drv", EntryPoint = "OpenPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
public static extern bool OpenPrinter([MarshalAs(UnmanagedType.LPStr)] string szPrinter, out IntPtr hPrinter, IntPtr pd);

[DllImport("winspool.Drv", EntryPoint = "ClosePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
public static extern bool ClosePrinter(IntPtr hPrinter);

[DllImport("winspool.Drv", EntryPoint = "StartDocPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
public static extern bool StartDocPrinter(IntPtr hPrinter, Int32 level, [In, MarshalAs(UnmanagedType.LPStruct)] DOCINFOA di);

[DllImport("winspool.Drv", EntryPoint = "EndDocPrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
public static extern bool EndDocPrinter(IntPtr hPrinter);

[DllImport("winspool.Drv", EntryPoint = "StartPagePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
public static extern bool StartPagePrinter(IntPtr hPrinter);

[DllImport("winspool.Drv", EntryPoint = "EndPagePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
public static extern bool EndPagePrinter(IntPtr hPrinter);

[DllImport("winspool.Drv", EntryPoint = "WritePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
public static extern bool WritePrinter(IntPtr hPrinter, IntPtr pBytes, Int32 dwCount, out Int32 dwWritten);

// SendBytesToPrinter()
// When the function is given a printer name and an unmanaged array
// of bytes, the function sends those bytes to the print queue.
// Returns true on success, false on failure.
public bool SendBytesToPrinter(string szPrinterName, IntPtr pBytes, Int32 dwCount)
{
Int32 dwError = 0, dwWritten = 0;
IntPtr hPrinter = new IntPtr(0);
DOCINFOA di = new DOCINFOA();
bool bSuccess = false; // Assume failure unless you specifically succeed.

di.pDocName = "Dipendraz Printing Code";
di.pDataType = "RAW";

// Open the printer.
if (OpenPrinter(szPrinterName.Normalize(), out hPrinter, IntPtr.Zero))
{
// Start a document.
if (StartDocPrinter(hPrinter, 1, di))
{
// Start a page.
if (StartPagePrinter(hPrinter))
{
// Write your bytes.
bSuccess = WritePrinter(hPrinter, pBytes, dwCount, out dwWritten);
EndPagePrinter(hPrinter);
}
EndDocPrinter(hPrinter);
}
ClosePrinter(hPrinter);
}
// If you did not succeed, GetLastError may give more information
// about why not.
if (bSuccess == false)
{
dwError = Marshal.GetLastWin32Error();
}
return bSuccess;
}

public bool SendFileToPrinter(string szPrinterName, string szFileName)
{
// Open the file.
FileStream fs = new FileStream(szFileName, FileMode.Open);
// Create a BinaryReader on the file.
BinaryReader br = new BinaryReader(fs);
// Dim an array of bytes big enough to hold the file's contents.
Byte[] bytes = new Byte[fs.Length];
bool bSuccess = false;
// Your unmanaged pointer.
IntPtr pUnmanagedBytes = new IntPtr(0);
int nLength;

nLength = Convert.ToInt32(fs.Length);
// Read the contents of the file into the array.
bytes = br.ReadBytes(nLength);
// Allocate some unmanaged memory for those bytes.
pUnmanagedBytes = Marshal.AllocCoTaskMem(nLength);
// Copy the managed byte array into the unmanaged array.
Marshal.Copy(bytes, 0, pUnmanagedBytes, nLength);
// Send the unmanaged bytes to the printer.
bSuccess = SendBytesToPrinter(szPrinterName, pUnmanagedBytes, nLength);
// Free the unmanaged memory that you allocated earlier.
Marshal.FreeCoTaskMem(pUnmanagedBytes);
return bSuccess;
}

public bool SendStringToPrinter(string szPrinterName, string szString)
{
IntPtr pBytes;
Int32 dwCount;
// How many characters are in the string?
dwCount = szString.Length;
// Assume that the printer is expecting ANSI text, and then convert
// the string to ANSI text.
pBytes = Marshal.StringToCoTaskMemAnsi(szString);
// Send the converted ANSI string to the printer.
SendBytesToPrinter(szPrinterName, pBytes, dwCount);
Marshal.FreeCoTaskMem(pBytes);
return true;
}
}