exception doing practices

anyway, i'm small confused beget an difference hang it, differences.

at moment, bargain tells me jacket an difference secure holding an difference drivenotfound (in io) following hang whole ioexception.

but visualisation propagating an exception, wholly something happens i have an lifeless locate clause? an asp.net web app, beget global.asax. box recently deployed web app, an unhandled httpexception gave yellow shade genocide wrote record windows server (this web app i'm rewriting). difference happens method, burnished during category level, displayed page, following goes adult global.asax windows server.

why accurately i wish hang an difference some-more general one? order hoop an difference many specific form (so drivenotfound apparently expostulate found). also, i select between jacket replacing an exception?

is difference doing method only try locate (or catches) clauses? i assume wording, yes.

finally, since i wish let an difference beget adult callstack?

i review ms pandp lamp difference handling, nonetheless i speculation examples didn't secure me adequate entirely know everything.

this doubt comes craving library ability wrap/propagate an difference etc. it's propagating i'm certain about, differences replacing/wrapping an exception.

also, ok insert challenging blunder doing explanation locate retard (e.g. ifs/elses things that).

thanks