Fileupload Problem.while submitting

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C#

ASP.NET

protected void btnsubmit_Click(object sender, EventArgs e)
  {
      try
      {
          if (Session["CheckRefresh"].ToString() == ViewState["CheckRefresh"].ToString())
                  {
                      DateTime dob = new DateTime();
                      dob = DateTime.Parse(txtdob.Text, Cul, System.Globalization.DateTimeStyles.NoCurrentDateDefault);

                      DateTime doj = new DateTime();
                      doj = DateTime.Parse(txtdoj.Text, Cul, System.Globalization.DateTimeStyles.NoCurrentDateDefault);

          obj.dob = dob.ToShortDateString();
          obj.doj =doj.ToShortDateString();



                    if (FileUpload1.HasFile)
                      {

                          filename = Path.GetFileName(FileUpload1.PostedFile.FileName);

                          //filename = FileUpload1.PostedFile.FileName;
                          Boolean stat = System.IO.File.Exists(Request.PhysicalApplicationPath + "/Upload/" + filename);
                          if (stat == true)
                          {
                              var chars1 = "abcdefghijklmnopqrstuvwxyz0123456789";
                              var Randomchar = new Random();
                              var reschar1 = new string(Enumerable.Repeat(chars1, 3).Select(n => n[Randomchar.Next(n.Length)]).ToArray());
                              filename = reschar1 + ".jpg";
                          }

                          //string targetPath = Server.MapPath("../Upload/" + filename.ToString());
                          //Stream strm = FileUpload1.PostedFile.InputStream;
                          //var targetFile = targetPath;

                          FileUpload1.SaveAs(Server.MapPath("../Upload/" + filename));
                          obj.photo = "../Upload/" + filename.ToString();
                      }
                      obj.Type = 3;
                      result = obj.Execute();
                      if (result > 0)
                      {
                          GetCustomercode();
                          msg.ShowAlertMessage("Inserted Successfully");
                          clear();

                      }

                  }
                  else
                  {
                      msg.ShowAlertMessage("select Image");
                  }
                  Session["CheckRefresh"] = Server.UrlDecode(System.DateTime.Now.ToString());
              }

      catch (Exception ex)
      {
          Response.Write(ex.ToString());
      }

  }

1.My execution not entering into if(fileupload1.Hasfile)
2.If the condition without fileupload it didnt take any dates. 1/1/2015,1/1/2015 it will take the value.
main prob is fileupload.