protected override void OnPreRender(EventArgs e)
{
var script = string.Format(
@"
function {0} {{
$get('{1}').style.display = 'none';
$get('{2}').style.display = '';
setTimeout('document.{3}.submit()', 1000);
}}",
UploadFileFunctionName,
selectPanel.ClientID,
loadingPanel.ClientID,
Page.Form.Name);
Page.ClientScript.RegisterClientScriptBlock(GetType(), "UploadFileFunctionName",
script, true);
}