Try to rebuild not just build the project.
Are you maybe also using VSS?

i tried rebuild and it seem to be ok.
no.im not using vss

Yes sometimes Build doesn't do the job. I don't know why, but rebuilding makes
it ok. MOstly it happenes when you have more than one project  in your solution
and related projects don't build.

This is because at compile  time, the compiler sometimes is not able to
calculate all the dependencies and the files that need to be built
correctly. As a result, the linking order is also not right sometimes.

correct.
i have more than 1 proj in my solu...

Thats about it ...

Its the link order....

.... and genearally you'll be referncing the result of one project  within
that of another project.

.... You can set the build order - but i can't seem to achive this ? Has any
one any success on setting build order ???
I tend to rebuild every project individually in the order I choose ( a
matter of reflex now anyway)
Watch out if you use your own toolbox controls aswell, close and reopen
solution space on changes.