HELP!!!!!!!!!!!!!!

如果数据库返回的结果为空的话,我想写一句话: "你想查的结果不存在 " ,该怎么写???? OleDbConnection myConnection = cn;
DataSet ds = new DataSet();
OleDbDataAdapter adapter = new OleDbDataAdapter("select * from db where ip>100", myConnection);
adapter.Fill(ds, "lpan");
MyDataGrid.DataSource = ds.Tables["lpan"].DefaultView;
MyDataGrid.DataBind();