In DataGridView, to achieve such effect, at the same time more than modify the selected cell, text box has been achieved,
But DataGridViewComboBoxCell cell, as a result of the default need to click twice to the pop-up drop-down list, so I added: in the event of CellEnter SendKeys. Send (" {F4} "); Such cell receives the input focus when the pop-up drop-down options, but also will not be able to choose more,

Excuse me how to implement the click DataGridViewComboBoxCell cell when a drop-down, multiple DataGridViewComboBoxCell cell can be selected at the same time?
And how to make the click a cell pop-up drop-down items other selected cell remain selected,

Ultimate aim is to want to do a bulk modify functions: after modify a cell, and other selected cell change