What is wrong with the code

[newmember]

Hi all,
i m new to c#, can anybody please tell me what is wrong with this code why it is throwing error, there is only one records in dataset, and i m trying to update the table with the values in the data set

Error Message is : Command contains unrecognised phrase/key words

			try
			{
				foreach( DataRow dtrow in ds.Tables[0].Rows)
				{
					
					string mmicr,msortcode,maccount,msrl,mserial,mamount ;
					mmicr = dtrow["micr"].ToString().PadLeft(6,'0') ;
					maccount = dtrow["account"].ToString().PadLeft(6,'0') ;
					msortcode = dtrow["sortcode"].ToString() ;
					msrl = dtrow["srl"].ToString() ;
					mamount = dtrow["amount"].ToString().PadLeft(13,'0') ;
					mserial = dtrow["serial"].ToString() ;
					OleDbDataAdapter danew = new OleDbDataAdapter(
						"UPDATE " + dbfname + " set micr = '" + mmicr + "',account = '" + maccount + "',sortcode = '" + msortcode + "',amount = '" + mamount + "',srl = '" + msrl + "' where serial == '" + mserial  , Dconn);
					DataTable dtnew = new DataTable() ;
					danew.Fill(dtnew) ;
				}
			}
			catch (Exception exp)
			{
	
				MessageBox.Show(exp.Message) ;
			}