How to increase cell quantity using keyboard up and down arrows ?

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C#5.0

.NET4.6

How to increase cell quantity using keyboard up and down arrows ?

I work on windows form desktop application using csharp

I face issue I can't increase quantity or decrease using press on key up or down
on datagridview control

when have quantity 1 value then when press up arrow then will be 2

when have quantity 2 then when press down arrow will be 1

so please which event i use it on datagridview windows form csharp to do that

What I have tried:

private void GridTrxInvF_KeyPress(object sender, KeyPressEventArgs e)  
    {  
        int currentNumber = Utilities.ObjectConverter.ConvertToInteger(GridTrxInvF.Rows[GridTrxInvF.CurrentCell.RowIndex].Cells["Quantity"].Value);  
  
        if (e.KeyChar ==(char) Keys.Down)  
        {  
  
            GridTrxInvF.Rows[GridTrxInvF.CurrentCell.RowIndex].Cells["Quantity"].Value = (currentNumber - 1).ToString();  
        }  
        else if (e.KeyChar == (char)Keys.Up)  
        {  
            GridTrxInvF.Rows[GridTrxInvF.CurrentCell.RowIndex].Cells["Quantity"].Value = (currentNumber + 1).ToString();  
        }  
  
    }