Hi.

Where I can find the source file of Default.aspx.cs, WebChatClient.cs, WebChatConfiguration.cs, WebChatUtility.cs & Conversation.aspx.cs?

These cs files are compiled into a dll and placed in the directory so will not be visible. Only the asp pages are available for customization.

Thanks for your information.

As our customer does not need to input anything in the default page, is it possible that we merge the default.aspx and conversation.aspx into single page and show the conversation page directly?

Absolutely.. The out-of-box aspx pages are just sample pages and are expected to be customized by customers as per need.

Having said that, please be aware that the old WebChat ASP based API has been deprecated from EMC 6.5 onwards (2016), and new CS Portal supporting ReST APIs published, which are much more secure and strongly recommended. This new API also comes with similar Web Chat JS/HTML6 sample web pages (CS Portal sample client), which can also be customized and is the contemporary technology.