private void btnOld_Click(object sender, EventArgs e)
{
HousingCooperativeEntities context = new HousingCooperativeEntities();
dgvData.DataSource = context.SelectRates(2).ToList();
btnEdit.Enabled = false;
}
private void LoadData()
{
HousingCooperativeEntities context = new HousingCooperativeEntities();
dgvData.DataSource = context.SelectRates(1).ToList();
btnEdit.Enabled = true;
}