C# C从db到treeview菜单创建

我的目标是使用dt、ds和从DB表获取数据来创建treeview菜单。我的代码如下所示。Ds出现错误，我在代码中标记它，您可以看到。。它在“İşlemleri”附近给出错误Systax，İlemleri是tnParent.Text包含的值的一部分。吉埃勒梅里

  void fill_Tree2()
  {

     DataSet PrSet = PDataset("select * from mnu_tbl_mnuElmnlr");

     treeView1.Nodes.Clear();

     foreach (DataRow dr in PrSet.Tables[0].Rows)
     {

        TreeNode tnParent = new TreeNode();

        tnParent.Text = dr["MenuAdi"].ToString();  /////////////////// 'Gişe İşlemleri' 
        tnParent.Tag = dr["id"].ToString(); 


        tnParent.Expand();

        treeView1.Nodes.Add(tnParent);

        FillChild(tnParent, tnParent.Text);

     }

  }

  public void FillChild(TreeNode parent, string ParentId)
  {

     DataSet ds = PDataset("Select altMenuAdi from mnu_tbl_AltElmnlr where ustMenuId = (select id from mnu_tbl_mnuElmnlr)); 

     parent.Nodes.Clear();

     foreach (DataRow dr in ds.Tables[0].Rows)
     {

        TreeNode child = new TreeNode();

        child.Text = dr["altMenuAdi"].ToString();       

        //  child.Tag = dr["ChildId"].ToString().Trim();

        parent.Nodes.Add(child);

     }

  }


  protected DataSet PDataset(string Select_Statement)
  {

     SqlConnection conn = new SqlConnection();

     //   conn.ConnectionString = ConfigurationManager.ConnectionStrings["1123"].ConnectionString;

     SqlConnection SqlCon = new SqlConnection("server=123;Database=123;Trusted_Connection=True;");

     SqlDataAdapter ad = new SqlDataAdapter(Select_Statement, SqlCon);

     DataSet ds = new DataSet();

     ad.Fill(ds);  /////// Here it gives an error  " Incorrect Systax near 'İşlemleri' "

     return ds;


  }

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ustMenuId是什么数据类型？ustMenuId类型在数据库中是Int您是否尝试直接运行对sql server的查询？我用此更改查询，但这次它显示Select altMenuAdi from mnu_tbl_AltElmnlr，其中ustMenuId=Select id from mnu_tbl_mnuElmnlr子查询返回的值超过1。当子查询在=、！=、=或者当子查询用作表达式时。请从mnu_tbl_mnuElmnlr中选择top 1 id，但是否有多个具有相同id的值？