csv save

Ups I apologize, I didn't pay intention to the specified language.
Unfortunately I haven't used PHP over 5 years now so...
But nevertheless try this for CSV to HTML:
http://stackoverflow.com/questions/518795/dynamically-display-a-csv-file-as-an-html-table-on-a-web-page#518923
And this for vice versa:
http://stackoverflow.com/questions/10498632/converting-html-table-to-a-csv-automatically-using-php#10498941

Hi, well I'm not exactly sure what you want to accomplish.
But here is how you can get a HTML table from CSV:

var htmlTable = new StringBuilder();
using (var csvFile = File.OpenText("Sample.csv"))
{
    htmlTable.AppendLine("");
    while (!csvFile.EndOfStream)
    {
        htmlTable.AppendLine("  ");
        foreach (var csvValue in csvFile.ReadLine().Split(','))
            htmlTable.Append("    ");
        htmlTable.AppendLine("  ");
    }
    htmlTable.AppendLine("
").Append(csvValue).AppendLine("
");
}

Also in case I misunderstood you here is how you can get CSV from HTML table (I used HtmlAgilityPack library):

var csvTable = new StringBuilder();
var doc = new HtmlDocument();
doc.Load(desktop + "\\Sample.html");
foreach (HtmlNode row in doc.DocumentNode.SelectSingleNode("table").Descendants("tr"))
{
    foreach (var cell in row.ChildNodes)
        if (!string.IsNullOrWhiteSpace(cell.InnerText))
            csvTable.Append(cell.InnerText).Append(',');
    csvTable.AppendLine();
}

Note that these are just concepts, I really did not pay much attention for edge cases and other stuff so you will have to tweak the solution a bit, but nevertheless I hope they will help you as a sort of a guidelines.

Also in case you are interested you can try out with this .NET library for excel files. It simplifies the process of converting spreadsheet content that comes from various formats into some other format. For example you can check out this article that shows how you can convert between CSV, HTML but also XLS and XLSX with C#.