Data from dataGrid doesnt show in my textboxs. Why?

Question

Hi!

 

My codes sound well. But I don't understand why when I scroll updown with my arrow from keyboard. Its doesnt show up on my textbox? 

 

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)

{

SqlConnection con = new SqlConnection("Data Source=localhost\\sqlexpress;Initial Catalog=master;Integrated Security=True");

if (e.RowIndex >= 0)

{

DataGridViewRow row = this.dataGridView1.Rows[e.RowIndex];

codidoDataTempoRealFactu.Text = row.Cells["codigo"].Value.ToString();

designacaoDataTempoRealFactu.Text = row.Cells["designacao"].Value.ToString();

quantidadeDataTempoRealFactu.Text = row.Cells["quantidade"].Value.ToString();

precocompraDataTempoRealFactu.Text = row.Cells["preco_compra"].Value.ToString();

valorDataTempoRealFactu.Text = row.Cells["valor"].Value.ToString();

totalDataTempoRealFactu.Text = row.Cells["total"].Value.ToString();

}

}

}

}