Hi,
Finally... I choose a next way..

1) Add cmdSave to the form as WebControl button - and make style - hidden
2) Add cmd_Save as HTML button..
3) Add txtFormValues as HiddenField
3) for cmd_save html button I wrote JavaScript code.. for document.controls.all..... scan all controls and save ControlName-controlValue into Hidden Field
4) From JavaScript - do cmdSave.Click... and on server.. Read value of Hidden Field.. save XML, restore controls.

I thinking.. for my expirience in ASP.NET this is a best way :)))

Thanks for attention
Denis