/// Puts the current cell in edit mode.
private void monitorDataGrid_CellEnter(object sender, DataGridViewCellEventArgs e)
{
validFormat = true;
monitorDataGrid.EditMode = DataGridViewEditMode.EditOnEnter;
//monitorDataGrid.BeginEdit(false);
}

/// Occurs when a control for editing a cell is showing.
/// Performs custom initialization of the editing control when a cell enters edit mode
private void monitorDataGrid_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
mKeyUpController.Clear();
Control ctl = e.Control;

DataGridViewTextBoxEditingControl dText = (DataGridViewTextBoxEditingControl)ctl;
dText.EditingControlDataGridView.EditMode = DataGridViewEditMode.EditOnEnter;
dText.KeyDown += new KeyEventHandler(dText_KeyDown);
dText.KeyUp += new KeyEventHandler(dText_KeyUp);
}

void dText_KeyDown(object sender, KeyEventArgs e)
{
monitorDataGrid.CurrentCell.ErrorText = String.Empty;

if (e.KeyData == Keys.OemPeriod || e.KeyData == Keys.Decimal)
{

}
else if (
((int)e.KeyCode >= (int)Keys.D0 && (int)e.KeyCode <= (int)Keys.D9) ||
((int)e.KeyCode >= (int)Keys.NumPad0 && (int)e.KeyCode <= (int)Keys.NumPad9)
)
{
DataGridViewTextBoxEditingControl dText = (DataGridViewTextBoxEditingControl)sender;

e.Handled = false;

// This is needed for text to go 123 instead of 321
dText.PrepareEditingControlForEdit(false);
dText.DeselectAll();
}

}