private void LoadGridViewListaAlunos()
        {
            AlunoNegocio alunoNegocio = new AlunoNegocio();
            List<Aluno> listAlunos = alunoNegocio.ObterTodosAlunos();

            GridViewListaAlunos.Columns.Clear();

            GridViewListaAlunos.DataSource = listAlunos;
            GridViewListaAlunos.AutoGenerateColumns = false;

            BoundField bfNumeroPece = new BoundField();
            bfNumeroPece.DataField = "NumeroPece";
            bfNumeroPece.HeaderText = "Número Pece";
            GridViewListaAlunos.Columns.Add(bfNumeroPece);

            BoundField bfNome = new BoundField();
            bfNome.DataField = "Nome";
            bfNome.HeaderText = "Nome";
            GridViewListaAlunos.Columns.Add(bfNome);

            CommandField cmdField = new CommandField();
            cmdField.ButtonType = ButtonType.Image;
            cmdField.DeleteImageUrl = "Icons/cross.png";
            cmdField.EditImageUrl = "Icons/page_edit.png";
            cmdField.SelectImageUrl = "Icons/money_add.png";
            cmdField.ShowDeleteButton = true;
            cmdField.ShowEditButton = true;
            cmdField.ShowSelectButton = false;
            cmdField.EditText = "Editar Usuario";
            cmdField.DeleteText = "Remover Usuario";

            GridViewListaAlunos.Columns.Add(cmdField);
            GridViewListaAlunos.DataBind();
        }