Convert the HTML File to Word document in C# and VB.Net

Here is the basic example of converting HTML file into Word document.

HTML 

<asp:Button ID="btnExport" runat="server" Text="Export" OnClick="ExportToWord" />

Code

Namespaces

Imports System.IO

VB.Net

Protected Sub ExportToWord(ByVal sender As Object, ByVal e As EventArgs) Handles btnExport.Click
    Dim texts As String = File.ReadAllText("D:\Files\Index.html")
    Response.Clear()
    Response.Buffer = True
    Response.AddHeader("content-disposition", "attachment;filename=ExportedHTML.doc")
    Response.Charset = ""
    Response.ContentType = "application/vnd.ms-word"
    Response.Output.Write(texts)
    Response.Flush()
    Response.[End]()
End Sub

Screenshot

HTML File

Exporting

Exported Word Document

Glad to assist!