这个问题在 devexpress master detail gridview 中造成了很多麻烦
"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."
i want to know why this happens in the first place, so that i can check my code. thats why i am not posting my code
Its urgent :)