This sample demonstrates how to export data table into rtf file.

private void btnRTF_Click(object sender, EventArgs e)
{
    System.Data.OleDb.OleDbConnection oleDbConnection1
         = new System.Data.OleDb.OleDbConnection();
    oleDbConnection1.ConnectionString
        = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=..\..\..\..\Database\demo.mdb";

    System.Data.OleDb.OleDbCommand oleDbCommand1
        = new System.Data.OleDb.OleDbCommand();
    oleDbCommand1.CommandText = "select * from parts";
    oleDbCommand1.Connection = oleDbConnection1;

    Spire.DataExport.RTF.RTFExport rtfExport1
        = new Spire.DataExport.RTF.RTFExport();

    rtfExport1.ActionAfterExport = Spire.DataExport.Common.ActionType.OpenView;
    rtfExport1.DataFormats.CultureName = "zh-CN";
    rtfExport1.DataFormats.Currency = "c";
    rtfExport1.DataFormats.DateTime = "yyyy-M-d H:mm";
    rtfExport1.DataFormats.Float = "g";
    rtfExport1.DataFormats.Integer = "g";
    rtfExport1.DataFormats.Time = "H:mm";
    rtfExport1.FileName = "sample.doc";
    rtfExport1.RTFOptions.DataStyle.Font = new System.Drawing.Font("Arial", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.World);
    rtfExport1.RTFOptions.FooterStyle.Font = new System.Drawing.Font("Arial", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.World);
    rtfExport1.RTFOptions.HeaderStyle.Font = new System.Drawing.Font("Arial", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.World);
    rtfExport1.RTFOptions.TitleStyle.Alignment = Spire.DataExport.RTF.RtfTextAlignment.Center;
    rtfExport1.RTFOptions.TitleStyle.Font = new System.Drawing.Font("Arial", 10F, System.Drawing.FontStyle.Bold);
    rtfExport1.SQLCommand = oleDbCommand1;

    oleDbConnection1.Open();
    rtfExport1.SaveToFile();
}

Private Sub btnRTF_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRTF.Click
    Dim oleDbConnection1 As New System.Data.OleDb.OleDbConnection()
    oleDbConnection1.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=..\..\..\..\Database\demo.mdb"

    Dim oleDbCommand1 As New System.Data.OleDb.OleDbCommand()
    oleDbCommand1.CommandText = "select * from parts"
    oleDbCommand1.Connection = oleDbConnection1

    Dim rtfExport1 As New Spire.DataExport.RTF.RTFExport()

    rtfExport1.ActionAfterExport = Spire.DataExport.Common.ActionType.OpenView
    rtfExport1.DataFormats.CultureName = "zh-CN"
    rtfExport1.DataFormats.Currency = "c"
    rtfExport1.DataFormats.DateTime = "yyyy-M-d H:mm"
    rtfExport1.DataFormats.Float = "g"
    rtfExport1.DataFormats.[Integer] = "g"
    rtfExport1.DataFormats.Time = "H:mm"
    rtfExport1.FileName = "sample.doc"
    rtfExport1.RTFOptions.DataStyle.Font = New System.Drawing.Font("Arial", 10.0F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.World)
    rtfExport1.RTFOptions.FooterStyle.Font = New System.Drawing.Font("Arial", 10.0F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.World)
    rtfExport1.RTFOptions.HeaderStyle.Font = New System.Drawing.Font("Arial", 10.0F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.World)
    rtfExport1.RTFOptions.TitleStyle.Alignment = Spire.DataExport.RTF.RtfTextAlignment.Center
    rtfExport1.RTFOptions.TitleStyle.Font = New System.Drawing.Font("Arial", 10.0F, System.Drawing.FontStyle.Bold)
    rtfExport1.SQLCommand = oleDbCommand1

    oleDbConnection1.Open()
    rtfExport1.SaveToFile()
End Sub