private void dataGridView2_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
bool flag = true;
var senderGrid = (DataGridView)sender;
senderGrid.EndEdit();
for (int i = 0; i <= dataGridView2.Rows.Count - 1; i++)
{
if (e.RowIndex >= 0)
{
var cbxCell = (DataGridViewCheckBoxCell)senderGrid.Rows[i].Cells[1];
if (!(bool)cbxCell.Value)
{
flag = false;
}
}
}
btn1.Enabled = flag;
}