private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == 13)
{
dataGridView1.DataSource = itens.BuscaFornecedor(textBox1.Text.ToUpper(), comboBox2.Text);
if (dataGridView1.RowCount > 1)
{
button3.Visible = true;
}
}
}