Remove bleed from Pdf and merge - c#-4.0

Question

I am trying remove 3mm bleed size from pdf. by using below criteria
My source file is Source file
I am using below code to trim left and right
public void TrimLeftandRight(string sourceFilePath, string outputFilePath)
{
PdfReader pdfReader = new PdfReader(sourceFilePath);
float width = (float)GetPDFwidth(sourceFilePath);
float height = (float)GetPDFHeight(sourceFilePath);
float widthTo_Trim = iTextSharp.text.Utilities.MillimetersToPoints(3);
PdfRectangle rectrightside = new PdfRectangle(0, 0, width - widthTo_Trim, height);
PdfRectangle rectLeftside = new PdfRectangle(widthTo_Trim, 0, width, height);
// int[] pagealignment = new int[] { 8, 1, 2, 7, 6, 3, 4, 5 };
int[] pagealignment = new int[] { 6, 1, 2, 5, 4, 3 };
using (var output = new FileStream(outputFilePath, FileMode.CreateNew, FileAccess.Write))
{
// Create a new document
Document doc = new Document();
// Make a copy of the document
PdfSmartCopy smartCopy = new PdfSmartCopy(doc, output);
// Open the newly created document
doc.Open();
// Loop through all pages of the source document
for (int i = 1; i <= pdfReader.NumberOfPages; i++)
{
// Get a page
var page = pdfReader.GetPageN(i);
// Apply the rectangle filter we created
switch (i)
{
case 6:
page.Put(PdfName.CROPBOX, rectLeftside);
page.Put(PdfName.MEDIABOX, rectrightside);
break;
case 2:
page.Put(PdfName.MEDIABOX, rectrightside);
break;
case 4:
page.Put(PdfName.MEDIABOX, rectLeftside);
break;
case 1:
page.Put(PdfName.MEDIABOX, rectLeftside);
break;
case 5:
page.Put(PdfName.MEDIABOX, rectrightside);
// page.Put(PdfName.CROPBOX, rectLeftside);
break;
case 3:
page.Put(PdfName.CROPBOX, rectLeftside);
page.Put(PdfName.MEDIABOX, rectrightside);
break;
}
// Copy the content and insert into the new document
var copiedPage = smartCopy.GetImportedPage(pdfReader, i);
smartCopy.AddPage(copiedPage);
}
// Close the output document
smartCopy.Close();
doc.Close();
doc.Dispose();
}
}
the output of above code produces
Trimmed left and right file
and I used below code to merge trimmed files
public void CreategateFinalOutput(string inputfile)
{
double widthinpoints = iTextSharp.text.Utilities.MillimetersToPoints(897);
string onlyfilename = Path.GetFileName(inputfile);
// string originalfilename = Server.MapPath("~/Uploads/" + onlyfilename);
int Noofpagesinpdf = GetNoofpagesofpdf(inputfile);
// var a3doc = new Document(PageSize.A3.Rotate(), 0, 0, 0, 0);
double originalwidth = GetPDFwidth(inputfile);
float widthTo_Trim = iTextSharp.text.Utilities.MillimetersToPoints(3);
double width = (GetPDFwidth(inputfile) * 3);
width = widthinpoints;
double height = GetPDFHeight(inputfile);
var a3reader = new PdfReader(inputfile);
var a3doc = new Document(new Rectangle((float)width, (float)height));
var a3writer = PdfWriter.GetInstance(a3doc, new FileStream(Server.MapPath("~/RP/" + onlyfilename), FileMode.Create));
a3doc.Open();
var a3cb = a3writer.DirectContent;
PdfImportedPage page;
int totalPages = a3reader.NumberOfPages;
// int[] pagealignment = new int[] { 8, 1, 2, 7, 6, 3, 4, 5 };
int[] pagealignment = new int[] { 5, 6, 1, 2, 3, 4 };
int iteration = 1;
for (int i = 1; i <= totalPages; i++)
{
a3doc.NewPage();
var a3size = new Document(new Rectangle((float)width, (float)height));
//new code
int fistpage = 0;
int secpage = 0;
int thirdpage = 0;
switch (iteration)
{
case 1:
fistpage = 5;
secpage = 6;
thirdpage = 1;
break;
case 2:
fistpage = 2;
secpage = 3;
thirdpage = 4;
break;
}
double trimwidth = iTextSharp.text.Utilities.MillimetersToPoints(3);
page = a3writer.GetImportedPage(a3reader, fistpage);
double pagewidth = page.Width;
a3cb.AddTemplate(page, 0, 0);
i++;
page = a3writer.GetImportedPage(a3reader, secpage);
double pagewidtha = page.Width;
a3cb.AddTemplate(page, (float)(pagewidtha), 0);
i++;
page = a3writer.GetImportedPage(a3reader, thirdpage);
double pagewidthaThird = page.Width;
// a3cb.AddTemplate(page, (int)(a3size.Width / 2), 0); //commented
a3cb.AddTemplate(page, (float)(pagewidthaThird + pagewidth), 0);
iteration++;
a3doc.Close();
}
}
When i merged pdf by using above code the out put is not as per desire
Final output
Here we have removed borders of page 5 and 6 but when we merged there is border appearing .
You can see it downloading pdfs.. apologies for a such a big code. the help will be highly appreciated
I request to download pdfs and check pdfs for better views