combo box use in data grid view in csharp using windows application

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C#

Design as follows using data grid view ;


Day Period Eng Tam Mat Sci Soc Hindi Sports

mon 1 combo box(all staff)


i want the output as follows in that data grid view ;


Day Period Eng Tam Mat Sci Soc Hindi Sports


when i click using mouse in Tam subject cell when i press space key in keyboard that combo box want to visible and select the staff.

similarly when i click using mouse in Mat subject cell when i press space key in keyboard that combo box want to visible