Convert HTML to MHT or MHTML File Programmatically in C# .NET

HTML to MHT Advanced.cs

// Prepare HTML code with a link to another file and save it to the file as 'document.html'
string code = "<span>Hello, World!!</span> " +
            "<a href='document2.html'>click</a>";
File.WriteAllText("document.html", code);

// Prepare HTML code and save it to the file as 'document2.html'
code = @"<span>Hello, World!!</span>";
File.WriteAllText("document2.html", code);

// Change the value of the resource linking depth to 1 in order to convert document with directly linked resources
MHTMLSaveOptions options = new MHTMLSaveOptions()
{
    ResourceHandlingOptions =
    {
        MaxHandlingDepth = 1
    }
};

// Convert HTML to MHTML
Converter.ConvertHTML("document.html", options, "output.mht");

HTML to MHT.cs

// Initialize an HTML document from the file
HTMLDocument document = new HTMLDocument("input.html");

// Initialize MHTMLSaveOptions object
MHTMLSaveOptions options = new MHTMLSaveOptions();

// Convert HTML to MHTML
Converter.ConvertHTML(document, options, "output.mht");