Use a dictionary to save their chat users, as well as a linked list to save chat history chat screen scroll bars, the scroll bar when the page is refreshed automatically every scroll to the bottom

ajax_chat\AJAXChat.sln
.........\AJAXChat.suo
.........\.pp_Code\ChatUser.cs
.........\........\Msg.cs
.........\........\Room.cs
.........\Default.aspx
.........\Default.aspx.cs
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.........\Login.aspx
.........\Login.aspx.cs

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