The sample demonstrates how to handle merge event.

public partial class Form1 : Form
{
    private int lastIndex = 0;
    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        //Create word document
        Document document = new Document();
        document.LoadFromFile(@"..\..\..\..\..\..\Data\Fax2.doc");
        lastIndex = 0;

        List<CustomerRecord> customerRecords = new List<CustomerRecord>();
        CustomerRecord c1 = new CustomerRecord();
        c1.ContactName = "Lucy";
        c1.Fax = "786-324-10";
        c1.Date = DateTime.Now;
        customerRecords.Add(c1);

        CustomerRecord c2 = new CustomerRecord();
        c2.ContactName = "Lily";
        c2.Fax = "779-138-13";
        c2.Date = DateTime.Now;
        customerRecords.Add(c2);

        CustomerRecord c3 = new CustomerRecord();
        c3.ContactName = "James";
        c3.Fax = "363-287-02";
        c3.Date = DateTime.Now;
        customerRecords.Add(c3);

        //Execute mailmerge
        document.MailMerge.MergeField += new MergeFieldEventHandler(MailMerge_MergeField);
        document.MailMerge.ExecuteGroup(new MailMergeDataTable("Customer", customerRecords));

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

    void MailMerge_MergeField(object sender, MergeFieldEventArgs args)
    {
        //Next row
        if (args.RowIndex > lastIndex)
        {
            lastIndex = args.RowIndex;
            AddPageBreakForMergeField(args.CurrentMergeField);
        }
    }

    void AddPageBreakForMergeField(IMergeField mergeField)
    {
        //Find position of needing to add page break
        bool foundGroupStart = false;
        Paragraph paramgraph = mergeField.PreviousSibling.Owner as Paragraph;
        MergeField merageField = null;
        while (!foundGroupStart)
        {
            paramgraph = paramgraph.PreviousSibling as Paragraph;
            for (int i = 0; i < paramgraph.Items.Count; i++)
            {
                merageField = paramgraph.Items[i] as MergeField;
                if ((merageField != null) && (merageField.Prefix == "GroupStart"))
                {
                    foundGroupStart = true;
                    break;
                }
            }
        }

        paramgraph.AppendBreak(BreakType.PageBreak);
    }
}

public class CustomerRecord
{
    private string m_contactName;
    public string ContactName
    {
        get
        {
            return m_contactName;
        }
        set
        {
            m_contactName = value;
        }
    }

    private string m_fax;
    public string Fax
    {
        get
        {
            return m_fax;
        }
        set
        {
            m_fax = value;
        }
    }

    private DateTime m_date;
    public DateTime Date
    {
        get
        {
            return m_date;
        }
        set
        {
            m_date = value;
        }
    }
}

	Public Partial Class Form1
		Inherits Form
		Private lastIndex As Integer = 0
		Public Sub New()
			InitializeComponent()
		End Sub

		Private Sub button1_Click(sender As Object, e As EventArgs)
			'Create word document
			Dim document As New Document()
			document.LoadFromFile("..\..\..\..\..\Data\Fax2.doc")
			lastIndex = 0

			Dim customerRecords As New List(Of CustomerRecord)()

			Dim c1 As New CustomerRecord()
			c1.ContactName = "Lucy"
			c1.Fax = "786-324-10"
			c1.[Date] = DateTime.Now
			customerRecords.Add(c1)

			Dim c2 As New CustomerRecord()
			c2.ContactName = "Lily"
			c2.Fax = "779-138-13"
			c2.[Date] = DateTime.Now
			customerRecords.Add(c2)

			Dim c3 As New CustomerRecord()
			c3.ContactName = "James"
			c3.Fax = "363-287-02"
			c3.[Date] = DateTime.Now
			customerRecords.Add(c3)

			'Execute mailmerge
			document.MailMerge.MergeField += New MergeFieldEventHandler(AddressOf MailMerge_MergeField)
			document.MailMerge.ExecuteGroup(New MailMergeDataTable("Customer", customerRecords))

			'Save doc file.
			document.SaveToFile("Sample.doc", FileFormat.Doc)
		End Sub

		Private Sub MailMerge_MergeField(sender As Object, args As MergeFieldEventArgs)
			'Next row
			If args.RowIndex > lastIndex Then
				lastIndex = args.RowIndex
				AddPageBreakForMergeField(args.CurrentMergeField)
			End If
		End Sub

		Private Sub AddPageBreakForMergeField(mergeField As IMergeField)
			'Find position of needing to add page break
			Dim foundGroupStart As Boolean = False
			Dim paramgraph As Paragraph = TryCast(mergeField.PreviousSibling.Owner, Paragraph)
			Dim merageField As MergeField = Nothing
			While Not foundGroupStart
				paramgraph = TryCast(paramgraph.PreviousSibling, Paragraph)
				For i As Integer = 0 To paramgraph.Items.Count - 1
					merageField = TryCast(paramgraph.Items(i), MergeField)
					If (merageField IsNot Nothing) AndAlso (merageField.Prefix = "GroupStart") Then
						foundGroupStart = True
						Exit For
					End If
				Next
			End While

			paramgraph.AppendBreak(BreakType.PageBreak)
		End Sub
	End Class

	Public Class CustomerRecord
		Private m_contactName As String
		Public Property ContactName() As String
			Get
				Return m_contactName
			End Get
			Set
				m_contactName = value
			End Set
		End Property

		Private m_fax As String
		Public Property Fax() As String
			Get
				Return m_fax
			End Get
			Set
				m_fax = value
			End Set
		End Property

		Private m_date As DateTime
		Public Property [Date]() As DateTime
			Get
				Return m_date
			End Get
			Set
				m_date = value
			End Set
		End Property
	End Class
End Namespace

The sample demonstrates how to export doc document to PDF file.

//Create word document
Document document = new Document();

Section section = document.AddSection();
section.PageSetup.PageSize = PageSize.A4;
section.PageSetup.Margins.Top = 72f;
section.PageSetup.Margins.Bottom = 72f;
section.PageSetup.Margins.Left = 89.85f;
section.PageSetup.Margins.Right = 89.85f;

Paragraph paragraph = section.AddParagraph();
paragraph.Format.HorizontalAlignment = Spire.Doc.Documents.HorizontalAlignment.Left;
paragraph.AppendPicture(Image.FromFile("Word.png"));

String p1
    = "Microsoft Word is a word processor designed by Microsoft. "
    + "It was first released in 1983 under the name Multi-Tool Word for Xenix systems. "
    + "Subsequent versions were later written for several other platforms including "
    + "IBM PCs running DOS (1983), the Apple Macintosh (1984), the AT&T Unix PC (1985), "
    + "Atari ST (1986), SCO UNIX, OS/2, and Microsoft Windows (1989). ";
String p2
    = "Microsoft Office Word instead of merely Microsoft Word. "
    + "The 2010 version appears to be branded as Microsoft Word, "
    + "once again. The current versions are Microsoft Word 2010 for Windows and 2008 for Mac.";
section.AddParagraph().AppendText(p1).CharacterFormat.FontSize = 14;
section.AddParagraph().AppendText(p2).CharacterFormat.FontSize = 14;

//Save doc file to pdf.
document.SaveToFile("Sample.pdf", FileFormat.PDF);

'Create word document
Dim document As New Document()

Dim section As Section = document.AddSection()
section.PageSetup.PageSize = PageSize.A4
section.PageSetup.Margins.Top = 72.0F
section.PageSetup.Margins.Bottom = 72.0F
section.PageSetup.Margins.Left = 89.85F
section.PageSetup.Margins.Right = 89.85F

Dim paragraph As Paragraph = section.AddParagraph()
paragraph.Format.HorizontalAlignment = Spire.Doc.Documents.HorizontalAlignment.Left
paragraph.AppendPicture(Image.FromFile("Word.png"))

Dim p1 As String _
    = "Microsoft Word is a word processor designed by Microsoft. " _
    + "It was first released in 1983 under the name Multi-Tool Word for Xenix systems. " _
    + "Subsequent versions were later written for several other platforms including " _
    + "IBM PCs running DOS (1983), the Apple Macintosh (1984), the AT&T Unix PC (1985), " _
    + "Atari ST (1986), SCO UNIX, OS/2, and Microsoft Windows (1989). "
Dim p2 As String _
    = "Microsoft Office Word instead of merely Microsoft Word. " _
    + "The 2010 version appears to be branded as Microsoft Word, " _
    + "once again. The current versions are Microsoft Word 2010 for Windows and 2008 for Mac."
section.AddParagraph().AppendText(p1).CharacterFormat.FontSize = 14
section.AddParagraph().AppendText(p2).CharacterFormat.FontSize = 14

'Save doc file to pdf.
document.SaveToFile("Sample.pdf", FileFormat.PDF)

The sample demonstrates how to export doc document to XML file.

//Create word document
Document document = new Document();

Section section = document.AddSection();            

String[] header = { "Name", "Capital", "Continent", "Area", "Population" };
String[][] data =
    {
        new String[]{"Argentina", "Buenos Aires", "South America", "2777815", "32300003"},
        new String[]{"Bolivia", "La Paz", "South America", "1098575", "7300000"},
        new String[]{"Brazil", "Brasilia", "South America", "8511196", "150400000"},
        new String[]{"Canada", "Ottawa", "North America", "9976147", "26500000"},
        new String[]{"Chile", "Santiago", "South America", "756943", "13200000"},
        new String[]{"Colombia", "Bagota", "South America", "1138907", "33000000"},
        new String[]{"Cuba", "Havana", "North America", "114524", "10600000"},
        new String[]{"Ecuador", "Quito", "South America", "455502", "10600000"},
        new String[]{"El Salvador", "San Salvador", "North America", "20865", "5300000"},
        new String[]{"Guyana", "Georgetown", "South America", "214969", "800000"},
        new String[]{"Jamaica", "Kingston", "North America", "11424", "2500000"},
        new String[]{"Mexico", "Mexico City", "North America", "1967180", "88600000"},
        new String[]{"Nicaragua", "Managua", "North America", "139000", "3900000"},
        new String[]{"Paraguay", "Asuncion", "South America", "406576", "4660000"},
        new String[]{"Peru", "Lima", "South America", "1285215", "21600000"},
        new String[]{"United States of America", "Washington", "North America", "9363130", "249200000"},
        new String[]{"Uruguay", "Montevideo", "South America", "176140", "3002000"},
        new String[]{"Venezuela", "Caracas", "South America", "912047", "19700000"}
    };
Spire.Doc.Table table = section.AddTable();
table.ResetCells(data.Length + 1, header.Length);

// ***************** First Row *************************
TableRow row = table.Rows[0];
row.IsHeader = true;
row.Height = 20;    //unit: point, 1point = 0.3528 mm
row.HeightType = TableRowHeightType.Exactly;
row.RowFormat.BackColor = Color.Gray;
for (int i = 0; i < header.Length; i++)
{
    row.Cells[i].CellFormat.VerticalAlignment = VerticalAlignment.Middle;
    Paragraph p = row.Cells[i].AddParagraph();
    p.Format.HorizontalAlignment = Spire.Doc.Documents.HorizontalAlignment.Center;
    TextRange txtRange = p.AppendText(header[i]);
    txtRange.CharacterFormat.Bold = true;
}

for (int r = 0; r < data.Length; r++)
{
    TableRow dataRow = table.Rows[r + 1];
    dataRow.Height = 20;
    dataRow.HeightType = TableRowHeightType.Exactly;
    dataRow.RowFormat.BackColor = Color.Empty;
    for (int c = 0; c < data[r].Length; c++)
    {
        dataRow.Cells[c].CellFormat.VerticalAlignment = VerticalAlignment.Middle;
        dataRow.Cells[c].AddParagraph().AppendText(data[r][c]);
    }
}

//Save xml file.
document.SaveToFile("Sample.xml",FileFormat.Xml);

'Create word document
Dim document_Renamed As New Document()

Dim section As Section = document_Renamed.AddSection()

Dim header As String() = {"Name", "Capital", "Continent", "Area", "Population"}
Dim data As String()() = { _
        New String() {"Argentina", "Buenos Aires", "South America", "2777815", "32300003"}, _
        New String() {"Bolivia", "La Paz", "South America", "1098575", "7300000"}, _
        New String() {"Brazil", "Brasilia", "South America", "8511196", "150400000"}, _
        New String() {"Canada", "Ottawa", "North America", "9976147", "26500000"}, _
        New String() {"Chile", "Santiago", "South America", "756943", "13200000"}, _
        New String() {"Colombia", "Bagota", "South America", "1138907", "33000000"}, _
        New String() {"Cuba", "Havana", "North America", "114524", "10600000"}, _
        New String() {"Ecuador", "Quito", "South America", "455502", "10600000"}, _
        New String() {"El Salvador", "San Salvador", "North America", "20865", "5300000"}, _
        New String() {"Guyana", "Georgetown", "South America", "214969", "800000"}, _
        New String() {"Jamaica", "Kingston", "North America", "11424", "2500000"}, _
        New String() {"Mexico", "Mexico City", "North America", "1967180", "88600000"}, _
        New String() {"Nicaragua", "Managua", "North America", "139000", "3900000"}, _
        New String() {"Paraguay", "Asuncion", "South America", "406576", "4660000"}, _
        New String() {"Peru", "Lima", "South America", "1285215", "21600000"}, _
        New String() {"United States of America", "Washington", "North America", "9363130", "249200000"}, _
        New String() {"Uruguay", "Montevideo", "South America", "176140", "3002000"}, _
        New String() {"Venezuela", "Caracas", "South America", "912047", "19700000"} _
    }
Dim table As Spire.Doc.Table = section.AddTable()
table.ResetCells(data.Length + 1, header.Length)

' ***************** First Row *************************
Dim row As TableRow = table.Rows(0)
row.IsHeader = True
row.Height = 20    'unit: point, 1point = 0.3528 mm
row.HeightType = TableRowHeightType.Exactly
row.RowFormat.BackColor = Color.Gray
For i As Integer = 0 To header.Length - 1
    row.Cells(i).CellFormat.VerticalAlignment = VerticalAlignment.Middle
    Dim p As Paragraph = row.Cells(i).AddParagraph()
    p.Format.HorizontalAlignment = Spire.Doc.Documents.HorizontalAlignment.Center
    Dim txtRange As TextRange = p.AppendText(header(i))
    txtRange.CharacterFormat.Bold = True
Next

For r As Integer = 0 To data.Length - 1
    Dim dataRow As TableRow = table.Rows(r + 1)
    dataRow.Height = 20
    dataRow.HeightType = TableRowHeightType.Exactly
    dataRow.RowFormat.BackColor = Color.Empty
    For c As Integer = 0 To data(r).Length - 1
        dataRow.Cells(c).CellFormat.VerticalAlignment = VerticalAlignment.Middle
        dataRow.Cells(c).AddParagraph().AppendText(data(r)(c))
    Next
Next

'Save xml file.
document_Renamed.SaveToFile("Sample.xml", FileFormat.Xml)