How to get the event of a combo box in data grid view in vb.net

Hi,
Windows vb.net

a. I have added a combo box in data grid view in vb.net, in this on selecting the combo box the other values of the data grid view needs to be filled from sql database based on the selected value of the combo box. I don't know how to call the selectedindex value of the combo box to fill the other values of the data grid view.

b. I have also added a date picker in data gridview. I am not sure how to get the the value of the date time picker.

Please help me to solve this problem.

Thanks in advance
with regards,
Shyam
tshyamkumarmca@gmail.com