passing a value to a hidden form field

Hi

Newbie Question:

I have a dataset called "mxdata" that has a field called "mxorder" with an integer value.

I want to increment that value by 1 and pass the new value to a hidden form field.

ie:

variablex = mxdata.mxorder + 1

<input name="ordervalue" type="hidden" id="ordervalue" value="<%# variablex %>"/
Obviously this is incorrect. Can someone show me how I would do this?why not just add it to the viewstate?, the ultimate hidden field of all time :-)

ViewState("orderValue") = mxdata.mxorder + 1

then after a postback you can retrive it like this

somevar = cint(ViewState("orderValue"))