Should be:
<add key="ConnectionString" value="server=localhost;database=CuteChatSample;UID=websqlquiry;PWD=abcde;App=CuteChat" />
<add key="OnlineTimeout" value="300" />
<add key="CuteChat.SqlClient.ConnectionString" value="server=localhost;database=CuteChatSample;UID=websqlquiry;PWD=abcde;App=CuteChat" />
"-->" need to be removed.
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