Merge PDF Documents in C#.NET

     using YiiGo.Imaging.Basic;
     using YiiGo.Imaging.Basic.Core;
     using YiiGo.Imaging.Basic.Codec;
     using YiiGo.Imaging.PDF;

     namespace YG__Test
     {
     public partial class Form1 : Form
     {
     public Form1()
     {
     InitializeComponent();
     }

     public static string FolderName = "c:/";

     private void button1_Click(object sender, EventArgs e)
     {
     string fileName1 = FolderName + "Sample1.pdf";
     string fileName2 = FolderName + "Sample2.pdf";
     string fileNameMerged = FolderName + "Merged.pdf";

     YGDocument doc1 = YGFile.OpenDocumentFile(fileName1, new PDFDecoder());//use PDFDecoder open one pdf file

     YGDocument doc2 = YGFile.OpenDocumentFile(fileName2, new PDFDecoder());//use PDFDecoder open another pdf file

     BaseDocument docMerged = doc1.MergeDocument(doc2);//merge two pdf

     YGFile.SaveDocumentFile((YGDocument)docMerged, fileNameMerged, new PDFEncoder());//save new pdf

     }

     }
     }