C#: Import CSV file and get CSV headers

gistfile1.cs

public JsonResult ImportCSV(HttpPostedFileBase file)
{

    if (file == null)
        return Json(new JSON.Result() { Status = JSON.Result.StatusEnum.Failed, DisplayMessage = "No Upload File Present" });

    if (file.ContentLength == 0)
        return Json(new JSON.Result() { Status = JSON.Result.StatusEnum.Failed, DisplayMessage = "File does not have Content Length" });


    var delimiter = ",";
    var lineNumber = 0;
    var splitExpression = new Regex(@"(" + delimiter + @")(?=(?:[^""]|""[^""]*"")*$)");


    string[] headers = null;
    using (var reader = new StreamReader(file.InputStream))
    {
        string line = null;
        

        line = reader.ReadLine();
        headers = splitExpression.Split(line).Where(x => x != delimiter).ToArray();
    }

    return Json(new JSON.Result() { Status = JSON.Result.StatusEnum.Success, ReturnedData = JSON.Serialize(headers), DisplayMessage = "Headers" });
}