The sample demonstrates how to merge two documents.

private void button1_Click(object sender, EventArgs e)
{
    string fileName = OpenFile();
    string fileMerge = OpenFile();
    if ((!string.IsNullOrEmpty(fileName)) && (!string.IsNullOrEmpty(fileMerge)))
    {
        //Create word document
        Document document = new Document();
        document.LoadFromFile(fileName,FileFormat.Doc);

        Document documentMerge = new Document();
        documentMerge.LoadFromFile(fileMerge, FileFormat.Doc);

        foreach( Section sec in documentMerge.Sections)
        {
            document.Sections.Add(sec.Clone());
        }

        //Save doc file.
        document.SaveToFile("Sample.doc", FileFormat.Doc);

        //Launching the MS Word file.
        WordDocViewer("Sample.doc");
    }


}

private string OpenFile()
{
    openFileDialog1.Filter = "Word Document (*.doc)|*.doc";
    openFileDialog1.Title = "Choose a document to merage";

    openFileDialog1.RestoreDirectory = true;
    if (openFileDialog1.ShowDialog() == DialogResult.OK)
    {
        return openFileDialog1.FileName;
    }

    return string.Empty;
}

private void WordDocViewer(string fileName)
{
    try
    {
        System.Diagnostics.Process.Start(fileName);
    }
    catch { }
}

Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles button1.Click
	Dim fileName As String = OpenFile()
	Dim fileMerge As String = OpenFile()
	If ((Not String.IsNullOrEmpty(fileName))) AndAlso ((Not String.IsNullOrEmpty(fileMerge))) Then
		'Create word document
		Dim document_Renamed As New Document()
		document_Renamed.LoadFromFile(fileName,FileFormat.Doc)

		Dim documentMerge As New Document()
		documentMerge.LoadFromFile(fileMerge, FileFormat.Doc)

		For Each sec As Section In documentMerge.Sections
			document_Renamed.Sections.Add(sec.Clone())
		Next sec

		'Save doc file.
		document_Renamed.SaveToFile("Sample.doc", FileFormat.Doc)

		'Launching the MS Word file.
		WordDocViewer("Sample.doc")
	End If


End Sub

Private Function OpenFile() As String
	openFileDialog1.Filter = "Word Document (*.doc)|*.doc"
	openFileDialog1.Title = "Choose a document to merage"

	openFileDialog1.RestoreDirectory = True
	If openFileDialog1.ShowDialog() = DialogResult.OK Then
		Return openFileDialog1.FileName
	End If

	Return String.Empty
End Function

Private Sub WordDocViewer(ByVal fileName As String)
	Try
		Process.Start(fileName)
	Catch
	End Try
End Sub

The sample demonstrates how to insert break.

private void button1_Click(object sender, EventArgs e)
{
    //Create word document
    Document document = new Document();

    InsertBreak(document);

    //Save doc file.
    document.SaveToFile("Sample.doc",FileFormat.Doc);

    //Launching the MS Word file.
    WordDocViewer("Sample.doc");


}

private void InsertBreak(Document document)
{
    Section section = document.AddSection();
    Paragraph paragraph = section.AddParagraph();
    paragraph.AppendText("The sample demonstrates how to insert break.");
    paragraph.ApplyStyle(BuiltinStyle.Heading2);

    section.AddParagraph();
    paragraph = section.AddParagraph();
    paragraph.AppendText("Insert new page.");
    paragraph.ApplyStyle(BuiltinStyle.Heading4);

    section = document.AddSection();
    section.BreakCode = SectionBreakType.NewPage;

    section.AddParagraph();
    paragraph = section.AddParagraph();
    paragraph.AppendText("Next page.");
    paragraph.ApplyStyle(BuiltinStyle.Heading4);

}

private void WordDocViewer(string fileName)
{
    try
    {
        System.Diagnostics.Process.Start(fileName);
    }
    catch { }
}

Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles button1.Click
	'Create word document
	Dim document_Renamed As New Document()

	InsertBreak(document_Renamed)

	'Save doc file.
	document_Renamed.SaveToFile("Sample.doc",FileFormat.Doc)

	'Launching the MS Word file.
	WordDocViewer("Sample.doc")


End Sub

Private Sub InsertBreak(ByVal document_Renamed As Document)
	Dim section_Renamed As Section = document_Renamed.AddSection()
	Dim paragraph_Renamed As Paragraph = section_Renamed.AddParagraph()
	paragraph_Renamed.AppendText("The sample demonstrates how to insert break.")
	paragraph_Renamed.ApplyStyle(BuiltinStyle.Heading2)

	section_Renamed.AddParagraph()
	paragraph_Renamed = section_Renamed.AddParagraph()
	paragraph_Renamed.AppendText("Insert new page.")
	paragraph_Renamed.ApplyStyle(BuiltinStyle.Heading4)

	section_Renamed = document_Renamed.AddSection()
	section_Renamed.BreakCode = SectionBreakType.NewPage

	section_Renamed.AddParagraph()
	paragraph_Renamed = section_Renamed.AddParagraph()
	paragraph_Renamed.AppendText("Next page.")
	paragraph_Renamed.ApplyStyle(BuiltinStyle.Heading4)

End Sub

Private Sub WordDocViewer(ByVal fileName As String)
	Try
		Process.Start(fileName)
	Catch
	End Try
End Sub

The sample demonstrates how to merge nestedmail into a document.

private void button1_Click(object sender, EventArgs e)
{
    List list = new List();
    DataSet dsData = new DataSet();

    dsData.ReadXml(@"..\..\..\..\..\..\Data\Orders.xml");

    //Create word document
    Document document = new Document();
    document.LoadFromFile(@"..\..\..\..\..\..\Data\Invoice.doc");

    DictionaryEntry dictionaryEntry = new DictionaryEntry("Customer", string.Empty);
    list.Add(dictionaryEntry);

    dictionaryEntry = new DictionaryEntry("Order", "Customer_Id = %Customer.Customer_Id%");
    list.Add(dictionaryEntry);

    document.MailMerge.ExecuteWidthNestedRegion(dsData, list);
  
    //Save doc file.
    document.SaveToFile("Sample.doc", FileFormat.Doc);

    //Launching the MS Word file.
    WordDocViewer("Sample.doc");
}

private void WordDocViewer(string fileName)
{
    try
    {
        System.Diagnostics.Process.Start(fileName);
    }
    catch { }
}

Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles button1.Click
	Dim list_Renamed As New List(Of DictionaryEntry)()
	Dim dsData As New DataSet()

	dsData.ReadXml("..\..\..\..\..\..\Data\Orders.xml")

	'Create word document
	Dim document_Renamed As New Document()
	document_Renamed.LoadFromFile("..\..\..\..\..\..\Data\Invoice.doc")

	Dim dictionaryEntry_Renamed As New DictionaryEntry("Customer", String.Empty)
	list_Renamed.Add(dictionaryEntry_Renamed)

	dictionaryEntry_Renamed = New DictionaryEntry("Order", "Customer_Id = %Customer.Customer_Id%")
	list_Renamed.Add(dictionaryEntry_Renamed)

	document_Renamed.MailMerge.ExecuteWidthNestedRegion(dsData, list_Renamed)

	'Save doc file.
	document_Renamed.SaveToFile("Sample.doc", FileFormat.Doc)

	'Launching the MS Word file.
	WordDocViewer("Sample.doc")
End Sub

Private Sub WordDocViewer(ByVal fileName As String)
	Try
		Process.Start(fileName)
	Catch
	End Try
End Sub