private datatable seleccina_dados(int id)
{
DataTable tb = new DataTable();
// ligação a uma bd access
string ligacao_bd = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + caminhobd + ";Persist Security Info=False;";
OleDbConnection ligacao = new OleDbConnection(ligacao_bd);
ligacao.Open();
OleDbCommand cmd = ligacao.CreateCommand();
cmd.CommandText = "select id,nome from tab";
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
da.Fill(tb);
ligacao.Close();
return tb;
}