After File Download Refresh or Redirect to the same page in c#

Question

Please Help me how to Refresh or Redirect to the same page after downloading a file using c# code Please find the code I am using in c#.

I am used Below code also some time to check but not worked. Please give me the solution to refresh a page after file download, Because of i am lossing some mutipledropdownlist css is not working properly.

 string url = HttpContext.Current.Request.Url.AbsoluteUri;
 Response.AddHeader("Refresh", "3; url=" + url + "");

ScriptManager.RegisterStartupScript(this, this.GetType(), "onload", "javascript:location.reload(true);", true);

System.Web.UI.HtmlControls.HtmlMeta meta = new System.Web.UI.HtmlControls.HtmlMeta();
meta.Name = "Refresh";
meta.Content = "5;url=TCO.aspx";
this.Page.Header.Controls.Add(meta);

Response.ClearContent();
Response.AddHeader("Content-Disposition", "attachment; filename=" + myfile.Name);
Response.AddHeader("Content-Length", myfile.Length.ToString());
Response.ContentType = "application/x-mspowerpoint";
Response.WriteFile(myfile.FullName);
Response.Flush();
Response.End();

Thanks
Pradeep