数据库的format语句

string strName1 = "update  Error set AbsoE =" + A1.ToString() + " where Error.EG=" + textBox5.Text + "";
  string strName2 = "select Format("({0})",strName1)";

   OleDbDataAdapter myadapter2 = new OleDbDataAdapter(strName2, aConnection);
         DataSet ds2= new DataSet();
        myadapter2.Fill(ds2);
想将数据库表里的数据格式化成带括号的形式，但是一直不对，求各位指点