private void EnsureUpdatePanelFixups()
        {
               if (this.Page.Form != null)
               {
                   String fixupScript = @"
_spBodyOnLoadFunctionNames.push(""_initFormActionAjax"");
function _initFormActionAjax()
{
    if (_spEscapedFormAction == document.forms[0].action)
    {
        document.forms[0]._initialAction = document.forms[0].action;
    }
}
var RestoreToOriginalFormActionCore = RestoreToOriginalFormAction;
RestoreToOriginalFormAction = function()
{
    if (_spOriginalFormAction != null)
    {
        RestoreToOriginalFormActionCore();
        document.forms[0]._initialAction = document.forms[0].action;
    }
}

 public class AjaxUpdatePanelPart : WebPart
    {
        private Label label;
        private TextBox textBox;
        protected override void  CreateChildControls()
        {
            base.CreateChildControls();
            this.EnsureUpdatePanelFixups();
            UpdatePanel up = new UpdatePanel();
            up.ID = "UpdatePanel1";
            up.ChildrenAsTriggers = true;
            up.UpdateMode = UpdatePanelUpdateMode.Conditional;
            this.Controls.Add(up);
            this.textBox = new TextBox();
            this.textBox.ID = "TextBox";
            up.ContentTemplateContainer.Controls.Add(this.textBox);
            this.label = new Label();
            this.label.Text = "Enter your name.";
            up.ContentTemplateContainer.Controls.Add(this.label);
            LinkButton button = new LinkButton();
            button.Text = "Say Hello";
            button.ID = "HelloButton";  // Some controls need an ID to make them work with AJAX postbacks.
            button.Click += new EventHandler(HandleButtonClick);
            up.ContentTemplateContainer.Controls.Add(button);
        }
        private void HandleButtonClick(object sender, EventArgs eventArgs)
        {
            this.label.Text = "Hello " + this.textBox.Text;
        }
        private void EnsureUpdatePanelFixups()
        {
               if (this.Page.Form != null)
               {
                   String fixupScript = @"
_spBodyOnLoadFunctionNames.push(""_initFormActionAjax"");
function _initFormActionAjax()
{
    if (_spEscapedFormAction == document.forms[0].action)
    {
        document.forms[0]._initialAction = document.forms[0].action;
    }
}
var RestoreToOriginalFormActionCore = RestoreToOriginalFormAction;
RestoreToOriginalFormAction = function()
{
    if (_spOriginalFormAction != null)
    {
        RestoreToOriginalFormActionCore();
        document.forms[0]._initialAction = document.forms[0].action;
    }
}
";
                ScriptManager.RegisterStartupScript(this, typeof(AjaxUpdatePanelPart), "UpdatePanelFixup", fixupScript, true);
            }
        }
    }