thanks for all pepole that answer my question (and because my english is not good i can't find the words that express my felling...) ok, it's fine, i build the query that will create my friendly table and i generated the dataset that will hold the results and bind it to a datagrid (it is not possible to bind an order form to textboxes or anything else!! the datagrid is the excellent choice), but there is 2 problem i think: the first problem is what will happen if the user decide to make a change to the order ? the second problem is that i use the Ado.Net (and dataset) because i can use the data in a 'disconnected world' ! this mean that i need to work with the data for a long time (2 day maybe) befor i send finaly the data to the databse. so i can't use the T_Sql queries ! (because i need a connection to the datasource that is not availalble all the time !). so i always connect to the datasource, copy a portion of data to a local XML file, save it to disk to work with it, so i always work with DataView objects to make my queries ! my datasource is most the time is a local XML file that a dataset object will read when the application start !! so what is the solution !!

You can communicate with some models of casio electronic cash register (ECR) using serial communications. When I say some, I believe that certain models require an aditional comms board to be fitted. You will also require the protocol manual for the specific model of ECR to understand the format of the data to send. An understanding of how to manually program the ECR would help you understand the protocol manual. If you have no experience of this technology then you probably have a steep learning curve ahead. Have you climbed the north face of the Eiger? :) Regards Wayne Phipps ____________ Time is the greatest teacher... unfortunately, it kills all of its students LearnVisualStudio.Net