// INCLUIR NO BANCO
public void incluir(ModeloCategoria mCategoria)
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = daoConexao.Conexao;
cmd.CommandText = "insert into categoria(cat_nome) values(@nome); select @@IDENTITY;";
cmd.Parameters.AddWithValue("@nome", mCategoria.CatNome);
daoConexao.conectar();
mCategoria.CatCod = Convert.ToInt32(cmd.ExecuteScalar());
daoConexao.desconectar();
}