function getfile(filetype) {
    var SurveyId = $('#SurveyID').val();
    var url = '/Survey/GetSurveyFile';
    $.ajax({
        type: 'GET',
        url: url,
        data: { survey: SurveyId, surveyFileType: filetype },
        success: function (result) {
            // ?
        },
        error: function (result) {
            // handle errors
            location.href = "/Home/"
        }
    });
}

public FileResult GetSurveyFile(string survey, string surveyFileType)
{
    try
    {
        var tmpSurvey = EntityModelDataProvider.GetSurveyByID(int.Parse(survey));
        var tmpSurveyFileTypes = EntityModelDataProvider.GetSurveyFileTypes();
        var tmpSurveyFileType = tmpSurveyFileTypes.FirstOrDefault(_sft => _sft.SurveyFile_Type_Id == int.Parse(surveyFileType));
        var tmpFile = EntityModelDataProvider.GetSurveyFilesBySurveyAndType(tmpSurvey.Survey_PK, tmpSurveyFileType.SurveyFile_Type_PK);
        if (tmpFile != null)
        {
            byte[] fileBytes = tmpFile.SurveyFile;
            string fileName = tmpFile.SurveyFile_Name;
            return File(fileBytes, System.Net.Mime.MediaTypeNames.Application.Octet, fileName);
        }
        else
            throw new Exception("File not found!");
    }
    catch (Exception ex)
    {

        throw ex;
    }
}

function getfile() {
    $.ajax({
        type: 'get',
        url: '@Url.Action("Download")',
        success: function () {
            window.location = '@Url.Action("Download")';
        }
    });
}

$(function() {
    $('h2').on('click', getfile);
});


public FileResult Download()
{
    var bytes = System.IO.File.ReadAllBytes(Server.MapPath("~/123.txt"));
    return File(bytes, System.Net.Mime.MediaTypeNames.Application.Octet, "123.txt");
}

function getfile() {
    var p1 = Math.random().toString();
    var p2 = Math.floor(Math.random() * 100);

    window.location = '@Url.Action("Download")?' + 'p1=' + p1 + '&' + 'p2=' + p2;
}

$(function() {
    $('h2').on('click', getfile);
});


public FileResult Download(string p1, int p2)
{
    var bytes = System.IO.File.ReadAllBytes(Server.MapPath("~/123.txt"));
    return File(bytes, System.Net.Mime.MediaTypeNames.Application.Octet, string.Format("123_{0}_{1}.txt", p1, p2));
}

var result = $("input[id*='filelabel_']").filter(function () {
        return this.id.match(/filelabel_d+$/);
    }).length;

    $("input[id*='file_input_']").each(function (i, el) {
        result = result - 1;
        var inputId = el.id;//getting textbox id
        if ($("#" + inputId).val()!=null) {
            var inputtext = $("#" + inputId).val();
            if (inputId != "input") {
                var fid = inputId.substring(0, inputId.indexOf("_"));//t.substr(t.indexOf("_") + 1);
            }
            var lastindex = inputId.lastIndexOf("_");
            var id = inputId.substring(lastindex + 1);
            var mainlabel = $("#filelabel_" + id).text();
            var data = new FormData();
            var files = $(".FilePhoto").get(0).files;
            if (files.length > 0) {
                data.append("HelpSectionImages", files[0]);
            }
            else {

            }

            //var fileUpload = $("#" + inputId).get(0);
            //var files = fileUpload.files;
            //alert(files);
            //datav.push({ file: files });
            datav.push({ CId: fid, CLabel: mainlabel, CValue: inputtext, CControlType: "File", COption: null});
        }
    });

    //var result = $("label[id*='filelabel_']").filter(function () {
    //    return this.id.match(/filelabel_d+$/);
    //}).length;

    //$("label[id*='filelabel_']").each(function (i, el) {
    //    result = result - 1;

    //    var inputId = el.id;//getting textbox id

    //    if ($("#" + inputId).val()!="") {

    //        var inputtext = $("#" + inputId).val();

    //        if (inputId != "input") {
    //            var fid = inputId.substring(0, inputId.indexOf("_"));//t.substr(t.indexOf("_") + 1);
    //        }

    //        var lastindex = inputId.lastIndexOf("_");
    //        var id = inputId.substring(lastindex + 1);

    //        var mainlabel = $("#label_" + id).text();

    //        datav.push({ CId: fid, CLabel: mainlabel, CValue: inputtext, CControlType: "File", COption: null });

    //    }
    //    //result = result - 1;

    //    //var labelId = el.id;
    //    //var mainlabeltext = $("#" + labelId).text();
    //    //var lastindex = labelId.lastIndexOf("_");
    //    ////var lastid = labelId.substring(lastindex + 1);
    //    //var lastid = lastindex + 1;
    //    //var req = $("#hd" + labelId).val();
    //    //if (req == undefined) {
    //    //    req = 0;
    //    //}

    //    //if (result >= 0) {
    //    //    datav.push({ CSeq: lastid, CLabel: mainlabeltext, CValue: null, CControlType: "File", COption: null, CRequired: req });
    //    //}

    //});
}