After upload show uploaded file in Asp.net

Question

I have this Asp.net code:

<asp:Panel ID="pnlCustomer" runat="server">
  <p class=".SmallCaption">
    <b>Edit report</b></p>
  <table class="DataTable" id="Bug" cellspacing="0" cellpadding="2" width="100%" border="0">

    <tr>
      <td class="CellName" width="25%">
        <asp:Label CssClass="CasualForm" id="lblUploadFile" runat="server">Save new file</asp:Label>
      </td>
      <td class="CellValue" width="25%">
        <asp:FileUpload CssClass="formdata100" ID="fuUploadedFile" runat="server" />
      </td>
      <td class="CellName" width="50%" colspan="2">&nbsp;</td>
    </tr>

    <tr>
      <td class="CellName" width="25%">
        <asp:Button ID="btnDelete" runat="server" Text="Delete" OnClick="BtnDeleteReport" style="float:left" OnClientClick="if(confirm('Do you really want to delete this report?')) {this.disabled = true;} else {return false;}" UseSubmitBehavior="false" />
      </td>
      <td class="CellName" width="25%">&nbsp;</td>
      <td class="CellName" width="47%">
        <asp:Button ID="btnDownloadFile" runat="server" Text="Get Report" onclick="btnDownloadFile_Click" />
      </td>

      <td class="CellName" width="3%">
        <asp:Button ID="btnSave" runat="server" Text="Edit" OnClientClick="if(checkFileUploadSize()) {return true;}" onclick="btnEdit_Click" CommandArgument="Edit" />
      </td>
    </tr>

  </table>
</asp:Panel>

and this is backcode C#:

protected void btnEdit_Click(object sender, EventArgs e) {
  Button btnThis = (Button) sender;
  if (btnThis.Text == "Edit") {
    Edit();
    btnThis.Text = "Save";
  } else if (btnThis.Text == "Save") {
    Save();
    //btnThis.Text = "Edit";
  }
}


private void Save() {
  ReadDataFromGUI();

  // insert/update report in DB.
  int _id = reportsHandler.Update(report);
  Response.Redirect("~/ReportsEditor.aspx?id=" + _id);
}


private void ReadDataFromGUI() {
  if (report == null)
    report = new Support_Report();
  report.id = report_id;
  report.id_entity = int.Parse(ddlEntities.SelectedValue);
  report.inactive = cbInactive.Checked;
  report.name = txtName.Text.Trim();
  report.description = txtDescription.Text.Trim();
  report.report_condition = txtReportCondition.Text.Trim();

  int _so;
  isSortOrderInteger = int.TryParse(txtSortOrder.Text.Trim(), out _so);
  if (isSortOrderInteger) {
    report.sort_order = _so;
  }

  string StrFileName = Path.GetFileName(fuUploadedFile.FileName);

  int IntFileSize = fuUploadedFile.PostedFile.ContentLength;

  if (StrFileName != null && StrFileName != "") {
    string path = Utility.Utility.GenerateTempFileName(StrFileName);
    FileInfo fi = new FileInfo(path);
    fuUploadedFile.PostedFile.SaveAs(path);

    try {
      var extension = Path.GetExtension(StrFileName).Replace(".", "");
      report.report_type = extension;
      if (extension == "mrt") {
        var xml_doc = new XmlDocument();
        xml_doc.Load(path);
        report.report_file = xml_doc.OuterXml;
      } else {
        report.report_file = Convert.ToBase64String(File.ReadAllBytes(path));
      }
    } finally {
      fi.Delete();
    }
  }
}

When I insert a file and want it to upload it looks like this: Before But when I press the "save" button then that file is deleted on the page and refreshed the page. Still, that file is in the database but I can't see it on that page. Then it looks like this after saving: After Why is this happening? How to fix that it always shows me even after the update?