how to bind data to tree view in winform from three databasetables

[saikarun]

i want like this output
first parent element
in that child node
in child node again sub child node ...
can u help me out

[tlhintoq]

What have you tried/done/coded so far?
What error(s)/exception(s)/problem(s) is your current code causing?
Can you provide the relevant code segment that is causing the error?