How to Add cutom values in dropdown using vb.net

Question

Hi,
  Now i need my project for adding cusomt values in dropdown. meantime. I had dropdown named like biodata, its consists of age, gender,sex, religion. Now i need add item name custom in Dropdown for users chooses its from dropdown another pop-up will appear, and it had some items in form and they filled it up thier details respectively. and click ok then The selected values are returned to grid.
Anyone could known pls help me.
Advance in Thanks
H.AL-MUBARAK