از جوابي كه به سوال من نداديد واقعاً سپاسگذارم.جواب را مي گذارم تا اگه روزي كسي دنبال اين موضوع بود بتونه پيداش كنه:
Private Sub dgZamanbandi_CellDoubleClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles dgZamanbandi.CellDoubleClick
Try
If dgZamanbandi.Rows.Count <> 0 Then
Dim x As Integer = dgZamanbandi.CurrentCell.RowIndex
Dim mabdastring As String = dgZamanbandi.Rows(x).Cells(0).Value.ToString
cboMabda.Text = mabdastring
Dim maghsadstring As String = dgZamanbandi.Rows(x).Cells(1).Value.ToString
cboMaghsad.Text = maghsadstring
End If
Catch ex As Exception
MsgBox(ex.Message.ToString)
End Try
End Sub