Add a hidden Control(with runat=server) to your page. Access that control in your javascript and save the value that you want to take it to the webserver. After the request gets submitted to the server, you can access the hidden control from your aspx code-behind and proceed. Ravie...

Ravi Gopal.

To maintain multi user changes on a physical file, Open the file as below: FileStream fs = File.Open("C:\\abc.xml", FileMode.Open, FileAccess.ReadWrite, FileShare.Read); XmlDocument xmlDoc = new XmlDocument(); xmlDoc.Load(fs); Now you can read and update the xmlDoc object. and when you are done, you can use the same FileStream object to write back your changes to the xml file. As, we used FileAccess.ReadWrite we can read as well as write to the file. And as we used FileShare.Read we give other users only Read permission until we close the conenction.

Ravi Gopal.

As per the Table Relationships, Table3 refers only Table2 and Table2 refers Table1. And you are refreshing the ddltable2SEARCH list whenever ddltable1SEARCH selection changes. So, you don't need to consider both dropdown values to fill the datagrid. I would prefer : obj.SearchSubRoutine(Me.ddltable2SEARCH.SelectedValue)

Ravi Gopal.