We have a Insert page with DetailView and we have a DropDown which is bind with different table. Now we want to hide some fields on the selection which user has selected in the dropdown. We are not able to get SelectedIndexChanged Event of the DynamicDataControl which have a dropdownlist. Is there any way to achive this.

My first thought would be to create a IAutoFieldGenerator and then an attribute that takes an array of string values representing the values from the DDL that would hide the field that it was applied to. Then in the IAutoFieldGenerator I would get the value from the FieldTemplate see my Dynamic Data – Cascading FieldTemplates on my blog for how I got values out of dependee FieldTemplate using this value I would then check each field to see if it had the attribute and if so was the value there to hide it see Dynamic Data - Hiding Columns in selected PageTemplates for a similar implementation. Hope that made sense if not it may be worth doing a post on my blog.