Hello !
First try to use this link:
http://stackoverflow.com/questions/8206810/object-reference-not-set-to-an-instance-of-an-object[
^] for a quick reference.
Generally this exception occur when u didn't check any condition for null.Suppose u want some data to display on a page and u didn't check that this data is empty.
ex- if(txtname.text != null)
{
some code here........
}
in this case it doesn't give an exception.If u didn't check for null values then it gives an error.
I think u got my point.if not please let me know i will explain u in details.
Thanks.