SqlConnection con=new SqlConnection("server=accp-lzh;uid=sa;pwd=sasa;database=Northwind");

            SqlCommand cmd=con.CreateCommand();

            cmd.CommandType=CommandType.Text;

            cmd.CommandText=sql;

 

            SqlDataAdapter ada=new SqlDataAdapter();

            ada.SelectCommand=cmd;

            DataSet ds=new DataSet();

 

            con.Open();

            ada.Fill(ds,"Employees");

            con.Close();

 

            return ds;

        }

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