Private Sub FormApplications_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
OleDbDataAdapter.Fill(DataSet, "sometable")
Your trigger here to call the msgbox
If Not CBool(DataSet.Tables("sometable").Rows(0).Item("checkboxselected")) Then
messgebox.show("Warning Will Robinson, Danger Will Robinson")
End If