i have a button name save and a datagrid with 2 columns namely drugname which is a combo box and qtyused(simple) and a txtFirstName on the form

if the user enters firstname and 4got to enters or select the datagrid column
i want to remind him/her by a msgbox that she/he has to select the drug name and specify qtyused

a msgbox for the 2 columns drugname and qtyused


I am not clearly understand ur problem. but try this.
Use GotFocus () event of DataGrid and Check the Combo Box whether anything selected or not. If not, show the message box.

I think u need validation in save button click event.if datagrid.row.selected=true then
msgbox("Please select Drug name")

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