Hi Binod,
When you look in the mib file with notepad, do you see any traps? They would have something like NOTIFICATION-TYPE around the section.
It is possible you have a MIB file but there are no traps defined.
Maybe look at this thread too:
en.community.dell.com/.../20302557.aspx
Did you get the MIB from mibdepot.com or the vendor? If you could post a link, perhaps we can review.
Rob