ASTERISK.NET Write Configuration File

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Project Description:
I got a sample code for asterisk management on C#.NET Framework.
It is working fine but I can not update config file in server with this code.
Anybody let me know how to write config file with C# code.

This is code section to write configuration.
UpdateConfigAction config = new UpdateConfigAction("manager.conf", "manager.conf", true);
config.AddCommand(UpdateConfigAction.ACTION_NEWCAT, "testadmin");
config.AddCommand(UpdateConfigAction.ACTION_APPEND, "testadmin", "secret", "1234");
ManagerResponse response = manager.SendAction(config);
manager.conf file is updated but content is not

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