table附近有语法异常

table附近有语法错误
调试
  SqlConnection myConn = GetConnection();
  myConn.Open();
  string sqlStr = "select * from tb_Class ";
  SqlDataAdapter myDa = new SqlDataAdapter(sqlStr, myConn);
  DataSet myDs = new DataSet();
  myDa.Fill(myDs);
  GridView1.DataSource = myDs;
  GridView1.DataKeyNames = new string[] { "ClassID" };
  GridView1.DataBind();
  myDa.Dispose();
  myDs.Dispose();
  myConn.Close();
运行到 myDa.Fill(myDs);时说tb_Class附近有语法错误，本人一直找不出原因想问下大家是哪里出了问题？？？

------解决方案--------------------------------------------------------
表示看不出来。直接把"select * from tb_Class "去掉引号后扔到查询器里看看。
------解决方案--------------------------------------------------------
GridView1.DataSource = myDs[0]