Sending XML Data through Data Connection

I'm hoping someone can help me with this. I have a XML Data Connection that loads data from Asp.net (C#) code I've written. This works fine, I'm able to load the XML data form the .aspx file and display it on my dashboard. However, I really need to send some data ranges to the .aspx code as well as input. I've checked "Enable Send" along with "Enable Load" on my data connection & defined the range of data (just a few cells from a column) as input to my .aspx program. I set up a crossdomain file (even though I'm testing locally), but when ever I preview the dashboard "Enable Send" active, I always get the dreaded Error #2032

Does anyone have a sample of asp.net code (either c# or vb) that receives a data from the dashboard AND sends data back? What I'm attempting to do is to send 20 cells of input to my asp.net code, manipulate it in a simple way (say, multiply by 2) & send it back to the dashboard.

I did see the export2csv code example written in aspx/vb but I couldn't get that to work either 😔

Thanks a million in advance!

Laura