In this article I will explain with an example, how to convert HTML to Word Document in Windows Forms (WinForms) Application using C# and VB.Net.
First a DataGridView will be populated with some data using DataTable and then an HTML Table will be generated using the values from the DataGridView and will be saved to a Folder (Directory).
Finally, the HTML File will be converted into a Word Document using Microsoft Office Interop Library and saved to a Folder (Directory) in Windows Forms (WinForms) Application using C# and VB.Net.
 
 
Form Design
The Form consists of a DataGridView and a Button.
Convert HTML to Word in Windows Application using C# and VB.Net
 
 
Namespaces
You will need to import the following namespaces.
C#
using System.IO;
using Microsoft.Office.Interop.Word;
 
VB.Net
Imports System.IO
Imports Microsoft.Office.Interop.Word
 
 
Populating the DataGridView
Inside the Form Load event handler, the DataGridView is populated with data by making use of a dynamic DataTable with some records.
C#
private void Form1_Load(object sender, EventArgs e)
{
    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id", typeof(int)),
                        new DataColumn("Name", typeof(string)),
                        new DataColumn("Country",typeof(string)) });
    dt.Rows.Add(1, "John Hammond", "United States");
    dt.Rows.Add(2, "Mudassar Khan", "India");
    dt.Rows.Add(3, "Suzanne Mathews", "France");
    dt.Rows.Add(4, "Robert Schidner", "Russia");
    this.dataGridView1.DataSource = dt;
    this.dataGridView1.AllowUserToAddRows = false;
}
 
VB.Net
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
    Dim dt As New DataTable()
    dt.Columns.AddRange(New DataColumn() {New DataColumn("Id", GetType(Integer)), _
                                           New DataColumn("Name", GetType(String)), _
                                           New DataColumn("Country", GetType(String))})
    dt.Rows.Add(1, "John Hammond", "United States")
    dt.Rows.Add(2, "Mudassar Khan", "India")
    dt.Rows.Add(3, "Suzanne Mathews", "France")
    dt.Rows.Add(4, "Robert Schidner", "Russia")
    Me.dataGridView1.DataSource = dt
    Me.dataGridView1.AllowUserToAddRows = False
End Sub
 
 
Converting HTML to Word in Windows Application
When the Export Button is clicked, an HTML Table is created with string concatenation.
The HTML Table will contain columns same as that of the DataGridView and then a loop is executed over the DataGridView columns to add their header texts to the Header row of the HTML Table.
Once the Header row is populated then loop is executed over the DataGridView rows to add data rows to the HTML Table.
Then the HTML Table string will be saved to a Folder (Directory) as HTML File.
Finally, the HTML File will be converted to Word Document and saved to a Folder (Directory) and the HTML File is deleted.
C#
private void btnExport_Click(object sender, EventArgs e)
{
    //Table start.
    string html = "<table cellpadding='5' cellspacing='0' style='border: 1px solid #ccc;font-size: 9pt;font-family:arial'>";
 
    //Adding HeaderRow.
    html += "<tr>";
    foreach (DataGridViewColumn column in dataGridView1.Columns)
    {
        html += "<th style='background-color: #B8DBFD;border: 1px solid #ccc'>" + column.HeaderText + "</th>";
    }
    html += "</tr>";
 
    //Adding DataRow.
    foreach (DataGridViewRow row in dataGridView1.Rows)
    {
        html += "<tr>";
        foreach (DataGridViewCell cell in row.Cells)
        {
            html += "<td style='width:120px;border: 1px solid #ccc'>" + cell.Value.ToString() + "</td>";
        }
        html += "</tr>";
    }
 
    //Table end.
    html += "</table>";
 
    //Save the HTML string as HTML File.
    string htmlFilePath = @"E:\Files\DataGridView.htm";
    File.WriteAllText(htmlFilePath, html);
 
    //Convert the HTML File to Word document.
    _Application word = new Microsoft.Office.Interop.Word.Application();
    _Document wordDoc = word.Documents.Open(FileName: htmlFilePath, ReadOnly: false);
    wordDoc.SaveAs(FileName: @"E:\Files\DataGridView.doc", FileFormat: WdSaveFormat.wdFormatRTF);
    ((_Document)wordDoc).Close();
    ((_Application)word).Quit();
 
    //Delete the HTML File.
    File.Delete(htmlFilePath);
}
 
VB.Net
Private Sub btnExport_Click(sender As System.Object, e As System.EventArgs) Handles btnExport.Click
    'Table start.
    Dim html As String = "<table cellpadding='5' cellspacing='0' style='border: 1px solid #ccc;font-size: 9pt;font-family:arial'>"
 
    'Adding HeaderRow.
    html &= "<tr>"
 
    For Each column As DataGridViewColumn In dataGridView1.Columns
        html &= "<th style='background-color: #B8DBFD;border: 1px solid #ccc'>" & column.HeaderText & "</th>"
    Next
    html &= "</tr>"
 
    'Adding DataRow.
    For Each row As DataGridViewRow In dataGridView1.Rows
        html &= "<tr>"
 
        For Each cell As DataGridViewCell In row.Cells
            html &= "<td style='width:120px;border: 1px solid #ccc'>" & cell.Value.ToString() & "</td>"
        Next
 
        html &= "</tr>"
    Next
 
    'Table end.
    html &= "</table>"
 
    'Save the HTML string as HTML File.
    Dim htmlFilePath As String = "E:\Files\DataGridView.htm"
    File.WriteAllText(htmlFilePath, html)
 
    'Convert the HTML File to Word document.
    Dim word As _Application = New Microsoft.Office.Interop.Word.Application
    Dim wordDoc As _Document = word.Documents.Open(FileName:=htmlFilePath, ReadOnly:=False)
    wordDoc.SaveAs(FileName:="E:\Files\DataGridView.doc", FileFormat:=WdSaveFormat.wdFormatRTF)
    CType(wordDoc, _Document).Close()
    CType(word, _Application).Quit()
 
    'Delete the HTML File.
    File.Delete(htmlFilePath)
End Sub
 
 
Screenshots
The DataGridView
Convert HTML to Word in Windows Application using C# and VB.Net
 
The exported HTML File
Convert HTML to Word in Windows Application using C# and VB.Net
 
The exported Word Document
Convert HTML to Word in Windows Application using C# and VB.Net
 
 
Downloads
Download Code