GridEditFormItem

GridEditManager editMan = editedItem.EditManager;
IGridEditableColumn editableCol = (column as IGridEditableColumn);
IGridColumnEditor editor = editMan.GetColumnEditor( editableCol );

Dim editMan As GridEditManager = editedItem.EditManager
Dim editableCol As IGridEditableColumn = CType(column, IGridEditableColumn)
Dim editor As IGridColumnEditor = editMan.GetColumnEditor(editableCol)

if (e.Item is GridEditableItem && e.Item.IsInEditMode)
{
TextBox txt = (e.Item as GridEditableItem)["SomeColumnName"].Controls[0] as TextBox;
}

If Typeof e.Item Is GridEditableItem And e.Item.IsInEditMode Then
...
End If

foreach (DictionaryEntry entry in newValues)
{
Label1.Text += "\n<br />Key: " + entry.Key + "<br />New value: " + entry.Value + "<br /> Old value: " + editedItem.SavedOldValues[entry.Key] + "<br />";
}

For Each entry As DictionaryEntry In newValues
Label1.Text += "" & Microsoft.VisualBasic.Chr(10) & "<br />Key: " + entry.Key + "<br />New value: " + entry.Value + "<br /> Old value: " + editedItem.SavedOldValues(entry.Key) + "<br />"
Next