Problem in setting Target Node and Target Tree Property

Hi all,

I am new to asp.net. I am trying to do Web Control, i am not
understanding how to set properties of Target Node and Target Tree in
DMDecisionTreeViewer. From the link i have read to use this query
"SELECT ATTRIBUTE_NAME FROM [Model].CONTENT WHERE NODE_TYPE=2" to find
the node. But and where to use this query i dont know. Can any1 help
me out.
It will be a great help. Thanks in advance