ASP.NET/AJAX Dynamic Form

I need a sample created for a dynamic form or survey. I will be adding this to an existing project I have. Project must be coded in VB in ASP.Net. I think I would prefer an implementation with AJAX so the page isn't constantly being refreshed/reposted so the user response is somewhat seamless. - An XML file will control the survey (as attached). - A survey is rendered with questions in a combination of text boxes and drop down lists. When a user selects certain values from certain drop downs, child drop downs will be rendered below. See an execution description below. Execution Description (based on attached template): ..Page loads only rendering parent prompts (parent prompts: where prompt id = parent id) ....Prompt 1, 2, 3 rendered ..User selects "Blue" from Prompt 1, nothing changes ..User selects "Dogs" from Prompt 2 .... Prompt 5 rendered (Prompt 5's parent is 2, criteria specifies response 2.2 must be selected), Prompt 6 rendered as text box as it has no responses. .... User selects "Pug" from prompt 5 and enters the dog name in prompt 6 ..User selects "24-32" in Prompt 3 ..User clicks submit. ..Data will need to be written to a DB but I'm happy for it to all display in a label at the moment eg Control_ID - Value