How to display open/save dialog asp net mvc 4

I am able to request a file and also have it returned.
I don´t know how to display a open/save dialog box.

View:

function saveDocument() {
    $.ajax({
        url: '/Operacao/saveDocument',
        type: 'POST',
        DataType: "html",
        success: function (data) {
            //I get the file content here
        }
    });
}

Controller:

public void saveDocument() {
    Response.ContentType = "image/jpeg";
    Response.AppendHeader("Content-Disposition", "attachment; filename=SailBig.jpg");
    Response.TransmitFile(Server.MapPath("~/MyPDFs/Pdf1.pdf"));    
    Response.End();
}

Answers:

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Method 1

I think you cannot download a file in a browser async, just redirect the user to the action and the browser will open a save dialog window. In asp.net mvc you could have an action method to download a file resulting in a FileResult with the File method of the base controller.

public ActionResult SaveDocument()
{   
    string filePath = Server.MapPath("~/MyPDFs/Pdf1.pdf");
    string contentType = "application/pdf";

    //Parameters to file are
    //1. The File Path on the File Server
    //2. The content type MIME type
    //3. The parameter for the file save by the browser

    return File(filePath, contentType, "Report.pdf");
}

Method 2

One way to force firefox (doen’t work for chrome) to open the save dialogue is to set the contenttype to “application/octet-stream” and give it a filename with the correct extension.

public ActionResult SaveDocument()
{   
    string filePath = Server.MapPath("~/MyPDFs/Pdf1.pdf");
    string contentType = "application/octet-stream";  //<---- This is the magic

    //Parameters to file are
    //1. The File Path on the File Server
    //2. The content type MIME type
    //3. The parameter for the file save by the browser

    return File(filePath, contentType, "Report.pdf");
}

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0