DataGridView Cell Formating, Retrieving

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C#

Hi there.

Im doing a Windows Desktop Application using c#.

I have a DataGridView with 5 columns namely(MarkType, Mark1, Mark2, Mark3, Mark4) and it allows a user to enter two digit marks per 'MarkType'.

I need to format All Mark Cells to only allow two digits and no alphabetical letters.
I also need to retrieve those marks directly after they've been added and not on a save button.

I tried

int mark1=Convert.ToInt32(this.datagridview.CurrentRow.Selected.ToString());

to get the mark upon CellLeave_Event but doesn't work.

Any Help would do.

Regards