Incorrect syntax near the keyword 'by'. Incorrect syntax near the keyword 'where'.conn = new SqlConnection("Data Source=PROJECTIDEAS\\SQLEXPRESS;Initial Catalog=Amruta_Ontology;Integrated Security=True"); conn.Open(); da = new SqlD

conn = new SqlConnection("Data Source=PROJECTIDEAS\\SQLEXPRESS;Initial Catalog=Amruta_Ontology;Integrated Security=True");
            conn.Open();
            da = new SqlDataAdapter();
            da.SelectCommand = new SqlCommand();
            da.SelectCommand.Connection = conn;
            da.SelectCommand.CommandText = "with cte as (select  Para_id,classname,COUNT(*) [cnt] from ClassClassificationgroup by Para_id,classname),cte2as(select Para_id,classname,ROW_NUMBER() over(partition by Para_id,classname order by cnt desc) rno from cte) update A set ClassName= B.classname from  ParaClassification A  inner join cte2 B where B.rno=1";
            da.SelectCommand.CommandType = CommandType.Text;
            da.SelectCommand.ExecuteNonQuery();