ASP.NET viewstate problem

[Lomex]

I get this error:

"Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request. "

This happens after I try to rearrange controls in HTML and then press an imagebutton on the page while the app is running. After I disable ViewState it works fine. But I need viewstate, how can I fix this?

[GR7]

are u using vstudio to develop? if so, what version? or are you using webmatrix?

also, paste the exact error........i mean the technical data, so i can check it out. Plus, set the DEBUG property of the document to TRUE so you get more error information