>How can select the grid column value
I think something like ThisForm.Grid1.Column1.Text1.Value should work. But I would normally work with the underlying table, for example, MyTable.MyField.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)