please suggest me the code for adding the users in database table by using simple tree view structure

Hi,
A quick start would be to consider these scenario steps:
- each node can be a row a table
- each node can hava a unique integer "name" to be used as reference
- each node has of course its value
- each node will refer to it's parent
- adding a node means adding a row in the table
- when adding a node it is necessary to say to which parent it is linked by filling out its parent number (link)
- operations on nodes need to be defined, for example Add

etc

Hope this will point you in the right direction,
Cheers,