Creating CSV File C#

comply.cs

public string ComplyWithCSV(string sentense)
{
    if(!string.IsNullOrEmpty(sentense))
    {
        var stripped = sentense.Replace("\"", "\"\"");  // Replaces a " with ""
        sentense = "\"" + stripped + "\"";              // Add " to start and end to allow ,
    }
    return sentense;
}

creating-csv-file

public void CreateCsvFile()
{
  using (StringWriter sw = new StringWriter())
  {
      // Gets collection from _repository
      var rows = _repo.Get_Data();
      string[] headers = { "Column1", "Column2", "Column3", "Column4" };
      var fileName = "MyCsvFile";

      sw.WriteLine(String.Join(",", headers));

      foreach (var column in rows)
      {
          sw.WriteLine(String.Join(",", column.Prop1, column.Prop2, column.Prop3, column.Prop4));
      }

      HttpContext.Response.ClearContent();
      HttpContext.Response.AddHeader("content-disposition", "attachment;filename=" + fileName + ".csv");
      HttpContext.Response.ContentType = "application/csv";
      HttpContext.Response.Write(sw.ToString());
      HttpContext.Response.End();
  }
}