How Do I Set PrinteDocument

hello experts How Can i set PrindCoument so that it can print on 210mm x 90 mm paper centrally In Landscape Mode.

i have written the following Methods.On A4 Size paper, portrait Orientation it prints ok,

what is wrong is that i used A4 instead of actual size 210mm x 90 mm ( Widthxheight) , bad practise

loading the paper in printer (Samsung ML-1520 or Hp 1218nf) the printer paper left/right guide automaticaly centers the paper

but as experts can see that page is 210mm x 90 mm ( Widthxheight) Landscape Size,

How Can i modify my methods ChequePrint( false) to tell them my paer size & orientation

in the above method if i set the pd.DefaultPageSettings.Landscape = true;

it prints to far left (0,0) left/ top. 

 private void ChequePrint( bool ispreview)
        {
            PrintDocument pd = new PrintDocument();
            pd.PrintPage += new PrintPageEventHandler(this.pd_Printcheque);
            try
            {
                if (ispreview)
                {
                    PrintPreviewDialog pp = new PrintPreviewDialog();
                    pp.Document = pd;
                    pp.FormBorderStyle = FormBorderStyle.Fixed3D;                   
                    pp.SetBounds(20, 20, this.Width, this.Height);
                    pp.ShowDialog();
                }
                else
                    pd.Print();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }

//chequePrint
        private void pd_Printcheque(object sender, PrintPageEventArgs ev)
        {
            ev.Graphics.PageUnit = GraphicsUnit.Millimeter;
ev.PageSettings.HardMarginY);
            Font printFont =new Font("Arial Bold", 12);;
            float XDate = 0, yDate = 0, XPay = 0, yPay = 0, XRupeesInWord = 0, yRupeesInWord = 0, XRupeesInAmt = 0, yRupeesInAmt = 0;
            int namewidth=0, AmtWidth=0;
           try
            {
                DataRow[] rows = ds.Tables["dayBookchequePara"].Select("daybookno='" + cmbDayBooks.SelectedValue + "'");
                if (rows.Count() > 0)
                {
                    foreach (DataRow r in rows)
                    {
                        float.TryParse(r["date_x"].ToString(),out XDate) ;
                        float.TryParse(r["date_y"].ToString(), out yDate);
                        float.TryParse(r["pay_x"].ToString(), out XPay);
                        float.TryParse(r["pay_y"].ToString(), out yPay);
                        int.TryParse(r["namewidth"].ToString(), out namewidth);
                        float.TryParse(r["amtWord_x"].ToString(), out XRupeesInWord) ;
                        float.TryParse(r["amtWord_y"].ToString(), out yRupeesInWord);
                        float.TryParse(r["amt_x"].ToString(), out XRupeesInAmt);
                        float.TryParse(r["amt_y"].ToString(), out yRupeesInAmt);
                        int.TryParse(r["AmtWidth"].ToString(), out AmtWidth);
                        break;
                    }
                    ev.Graphics.DrawString(dtpDocDate.Value.ToString("dd/MM/yyyy"), printFont, Brushes.Black, XDate, yDate, new StringFormat());
                    string name = txtChqName.Text.Trim(), name2 = "";
                    if (string.IsNullOrWhiteSpace(name))
                        name = txtSLName.Text;
                    if (string.IsNullOrWhiteSpace(name))
                        name = txtGLName.Text;
                    if (name.Length > namewidth)
                    {
                        name2 = name.Substring(namewidth + 1);
                        name = name.Substring(0, namewidth);
                    }
                    ev.Graphics.DrawString(name, printFont, Brushes.Black, XPay, yPay, new StringFormat());
                    if ( name2 != "")
                        ev.Graphics.DrawString(name2, printFont, Brushes.Black, XPay, yPay+printFont.Height, new StringFormat());
                    ev.Graphics.DrawString(txtAmt.Text, printFont, Brushes.Black, XRupeesInAmt, yRupeesInAmt, new StringFormat());
                    NumberToIndian amtinword = new NumberToIndian();
                    string word = amtinword.changeCurrencyToWords(txtAmt.Text)+" Only", word2 = "";
                    if (word.Length > AmtWidth)
                    {
                        word2= word.Substring(AmtWidth+1);
                        word=word.Substring(0,AmtWidth);
                    }
                    ev.Graphics.DrawString(word, printFont, Brushes.Black, XRupeesInWord, yRupeesInWord, new StringFormat());
                    if ( word2 != "")
                        ev.Graphics.DrawString(word2, printFont, Brushes.Black, XRupeesInWord, yRupeesInWord + printFont.Height, new StringFormat());
                }
                else
                {
                    MessageBox.Show(@"Cheque Paratmers Not Found in Feed/Master/Daybooks"); 
                }
                ev.HasMorePages = false;
            }
            catch (Exception Ex)
            {
                MessageBox.Show("err in pd_PrintPage:-"+Ex.ToString());
            }
        }