Database

private void button1_Click(object sender, EventArgs e)
{
    //MessageBox.Show(dataGridView.ColumnCount.ToString());
    for (int column = 0; column < 1; column++)//this.dataGridView.ColumnCount
    {
        for (int row = 0; row < this.dataGridView.RowCount; row++)
        {
            //MessageBox.Show("Row,Column: "+row.ToString()+","+column.ToString());
            if (this.dataGridView.Rows[row].Cells[column].Value == null)
            {
                this.dataGridView.Rows[row].Cells[column].Style.BackColor= Color.Red;               //EDITED: changed property to BackColor like I should have posted it...
                //MessageBox.Show("Null at: " + row.ToString() + "," + column.ToString());
            }
        }
    }
}

private void Form1_Load(object sender, EventArgs e)
{
    // TODO: This line of code loads data into the '_Vehicle_EquipmentDataSet._Pickups___Cars' table. You can move, or remove it, as needed.
    this.pickups___CarsTableAdapter.Fill(this._Vehicle_EquipmentDataSet._Pickups___Cars);
}