Поиск строки в DataGridView 1

[tehadm]

private void button1_Click(object sender, EventArgs e)
        {
 
            for (int i = 0; i < dataGridView1.RowCount; i++)
            {
                dataGridView1.Rows[i].Selected = false;
                for (int j = 0; j < dataGridView1.ColumnCount; j++)
                    if (dataGridView1.Rows[i].Cells[j].Value != null)
                        if (dataGridView1.Rows[i].Cells[j].Value.ToString().Contains(textBox1.Text))
                        {
                            dataGridView1.Rows[i].Selected = true;
                            break;
                        }
            }
        }