The best way to troubleshoot this is by putting it in a try catch block. In case of any errors, log them. If there are no errors, check you connection string, where is it pointing to?

Try going around it. Manually add dummy data and try to retrieve it. If it works then try running the query in msg variable directly in query analyser or something to see if the query is actually working.

If all is well then it should work...

Store the parameters of the rectangle (box) such as how many arrows are connected to the box, what are their ids, where are each arrows pointing to. This way when you move the rectangle also check if there are any connected arrows to the box. If they are change their coordinates accordingly to the box coordinates. Change only the coords that are connected to the box and not of the other end.

Look into and . They are used to execute processes from within Windows or Console Applications.