Upload File ด้วย ASPxUploadControl จาก DevExpress

  <dx:ASPxUploadControl ID="ASPxUploadControl1" ClientInstanceName="uploadControl" 
                                        runat="server" FileUploadMode="OnPageLoad" Width="280px">
                                           <ValidationSettings MaxFileSize="41943040" AllowedFileExtensions=".pdf"
                                               ErrorStyle-CssClass="validationMessage" />
                                    </dx:ASPxUploadControl>
<br/>
 <dx:ASPxButton ID="btnAdd" runat="server" OnClick="btnAdd_Click"  Text="เพิ่มข้อมูล">
                                         <ClientSideEvents Click="OnClick" />
                                        </dx:ASPxButton>

 protected void btnAdd_Click(object sender, EventArgs e)
        {
            if (ASPxUploadControl1.UploadedFiles.Length > 0)
            {
                foreach (var file in ASPxUploadControl1.UploadedFiles)
                {
                    // file.SaveAs(MapPath(string.Format("~/upload/{0}", file.FileName)));
                    file.SaveAs(MapPath(string.Format("~/upload/{0}", file.FileName)));
                    Response.Write("success:" + file.FileName);
                }

                // Response.Write("uploaded:" + ASPxUploadControl1.UploadedFiles.Length.ToString());
            }
        }

..............................
  
    <httpRuntime maxRequestLength="30000000"  requestValidationMode="4.0" executionTimeout="3600" targetFramework="4.7.2" />
    <pages validateRequest="true" clientIDMode="Predictable">
      <controls>
        <add tagPrefix="dx" namespace="DevExpress.Web" assembly="DevExpress.Web.v21.2, Version=21.2.7.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" />
      </controls>
    </pages>
    <globalization culture="" uiCulture="" />
  </system.web>
  <system.webServer>

..............................

    <validation validateIntegratedModeConfiguration="false" />
    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="30000000" />
      </requestFiltering>
    </security>
  </system.webServer>
 ....................................
</configuration>