private void LimparFormulario()
{
lblProdCodigo.Text = String.Empty;
this.txtProdCodigo.Visible = false;
this.lblProdCodigo.Visible = false;
cmbProCategoria.SelectedIndex = -1;
cmbProUni.SelectedIndex = -1;
Uteis.LimparFormulario(txtProdNome);
Uteis.LimparMascara(txtProdPreco);
}