Changing cell in GridView by vlidation

I have a GridView and I want when I change a cell to see if开发者_如何学JAVA its new value is valid by mine function ValidateValue(string aValue) and if it is valid - to store the new value and old value as a pair in Struct S {string old,new}; How to do this?

---

Handle the GridView's ValidatingCell event for this purpose. Here is some sample code showing how to obtain new and old edit values:

private void gridView1_ValidatingEditor(object sender, DevExpress.XtraEditors.Controls.BaseContainerValidateEditorEventArgs e) {
    BaseEdit edit = (sender as GridView).ActiveEditor;
    object oldValue = edit.OldEditValue;
    object newValue = e.Value;
}