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I am evaluating dhtmlxGrid to use in web app. If I purchase commercial/enterprise license, shall I get classes/dll to use grid object in code behind (like samples given in php)?
Also can I use percentage for column width?

dhtmlxGrid is fully client side component. PHP samples is given for you just as examples.
To integrate dhtmlxGrid with server side you can use dhtmlxConnectors .net extension. dhtmlxConnector is a set of .NET classes which helps to simplify server side operations related to dhtmlx library components (dhtmlxGrid/TreeGrid, dhtmlxTree, dhtmlxCombo). You can download demo version here
Tutorial is available here … tornet:toc