How to Delete Subfolder in .cs page

 public void SaveDialog(string template, string visatypeid, string folderName, string fileType)

    {

        string filePath = Server.MapPath("" + folderName + "/" + visatypeid + "/" + fileType + "/" + template + "");

        System.IO.FileInfo targetFile = new System.IO.FileInfo(filePath);

        FileInfo objFileInfo = default(FileInfo);

        try

        {

            objFileInfo = new FileInfo(filePath);

            if (objFileInfo.Exists)

            {

                Response.Clear();

                Response.Cache.SetCacheability(System.Web.HttpCacheability.Private);

                Response.AddHeader("Content-Disposition", "attachment; filename=" + objFileInfo.Name);

                Response.AddHeader("Content-Length", objFileInfo.Length.ToString());

                Response.ContentType = "application/octet-stream";

                Response.WriteFile(filePath);

                Response.End();

            }

            else

            {

                Type cstype = this.GetType();

                ClientScriptManager cs = Page.ClientScript;

                cs.RegisterStartupScript(cstype, "onLoadCall", "", false);

            }

        }

        catch (Exception ex)

        {

            //MsgBox("error")

        }

    }


File Is Saving like that--Casefile/608/Document/file.txt Formate.

Now,i have to delete the subfolder menas--608/Document/File.txt


Anyone have a idea about how to do  it?