Private Sub cmdSearch_Click()
If Len(cboSearchField) = 0 Or IsNull(cboSearchField) = True Then
MsgBox "You must select a field to search."
ElseIf Len(txtSearchString) = 0 Or IsNull(txtSearchString) = True Then
MsgBox "You must enter a search string."
'End If
Else
'Generate search criteria...
