CellValueChanged

private: System::Void dataGridView1_CellStateChanged(System::Object^ sender, System::Windows::Forms::DataGridViewCellStateChangedEventArgs^ e) {

    if (!isRefreshed)
    {
        for (int i = 0; i < dataGridView1->Rows->Count - 1; i++)
        {
            if (dataGridView1->Rows[i]->Cells["amount"]->Value != nullptr &&
                Int32::Parse(dataGridView1->Rows[i]->Cells["amount"]->Value->ToString()) < 0)
            {
                dataGridView1->Rows[i]->Cells["amount"]->Value = "0";
                dataGridView1->Rows[i]->Cells["availability"]->Value = false;
            }
            else if (dataGridView1->Rows[i]->Cells["amount"]->Value != nullptr &&
                Int32::Parse(dataGridView1->Rows[i]->Cells["amount"]->Value->ToString()) == 0)
            {
                dataGridView1->Rows[i]->Cells["availability"]->Value = false;
            }
            else if (dataGridView1->Rows[i]->Cells["amount"]->Value != nullptr &&
                Int32::Parse(dataGridView1->Rows[i]->Cells["amount"]->Value->ToString()) > 0)
            {
                dataGridView1->Rows[i]->Cells["availability"]->Value = true;
            }
        }
    }
}