private void btnCheckAllMClients_Click(object sender, EventArgs e)
{
int ClientGroupID = 0;
if (dgvMClientsGroups.SelectedRows.Count > 0)
{
ClientGroupID = Convert.ToInt32(dgvMClientsGroups.SelectedRows[0].Cells["ClientGroupID"].Value);
}
OrdersManager.CheckMClients(true, ClientGroupID);
OrdersManager.CheckMClientGroups(true, ClientGroupID);
}