Force.com visualforce page ExportToCSV is not working

[snehal]

I am trying to use the ExporToCSV function in a visualforce page, but the sample code provided in the demo site doesn't work.
I am able to retrieve data but not able to save the exported file.

I tried to explain the issue in the attachment. Any help is much appreciated.

[paramvir]

Snehal

You also need to implement server side code as shown in the demo under ASP.NET and PHP tabs.
http://paramquery.com/pro/demos/export_csv

Server side code consists of two steps / requests:

1) Save the posted contents in a csv file and return file name.

Code: [Select]

[HttpPost, ValidateInput(false)]       
public String excel(String extension, String excel)
{
    if (extension != "csv" && extension != "xml")
    {               
        throw new Exception("Unsupported extension");
    }
    String filename = "pqGrid." + extension;           
    System.IO.File.WriteAllText(Server.MapPath("~") + "\\" + filename, excel);
    return filename;
}

2) Return the file to browser.

Code: [Select]

[HttpGet]
public FileContentResult excel(String filename)
{
    String path = Server.MapPath("~") + "\\" + filename;
    String contents = System.IO.File.ReadAllText(path);
 
    if(filename.EndsWith(".csv")){
        return File(new System.Text.UTF8Encoding().GetBytes(contents), "text/csv", filename);
    }
    else if(filename.EndsWith(".xml")){
        return File(new System.Text.UTF8Encoding().GetBytes(contents), "text/xml", filename);
    }
    else{
        throw new Exception("unknown extension");
    }
}