Sir, different exceptions are being shown at different times.
1. Index was out of range. Must be non-negative and less than the size of the collection.
2.Object reference not set to an instance of an object.
3.Cannot cast DBNULL to other type
4. there is no row at position 0 etc..
It is not rising continuous exception but after every 5-6 minutes and sometimes after every 1
minute it is rising exception.When an exception is occured on a machine,every machine accessing that site get same exception.