Use the controls such as DateTimePicker, ComboBox, NumericUpdown in the cell of DataGridColumnStyle
Downloads include: DataGridComboBoxColumnStyle (download from http://windowsforms.net/TrackViews.aspx?ID=131&Type=Samples&Redir=/Samples/download.aspx?PageId=1&ItemId=131&tabindex=4)DataGridDateTimePickerColumnStyle (original) DataGridNumericUpDownColumnStyle ( Original)
