editor task activated from button on the form

Dear all,
i have developed a tool with the support of the "Cut polygon without selection" task of the esri samples in 9.3 with vb6.
For my further studies i need to convert all codes to vb.net which runs on 9.3
But im very difficult to find out how to activate the "Cut polygon without selection" programtically when a user form button click. cananyone help me in this issue please.
thank you
Pradeep Rathnayake