I have no Idea how do I start with it because all we have in the designer of datagridview is buttons,textboxes n combo boxes.
I want to give it a feel such as :
when the user clicks on the column the column should show a time picker only and not the date picker.
I have actually a code running that validates the textbox if it contains a valid time or not but it has a lot of bugs that the user can get through.
And moreover the user wont feel at home while manually typing in all the digits.
Basically you need to 'create' the DateTimePicker column and then add it to the datagrid. See the following SO question: Manipulate The Currenly Edited Row in a grid view