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     Configuration config = WebConfigurationManager.OpenWebConfiguration(null);
     AppSettingsSection app = config.AppSettings;
    app.Settings.Add("key", "valueadd");
    config.Save(ConfigurationSaveMode.Modified);
  
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     Configuration config = WebConfigurationManager.OpenWebConfiguration(null);
     AppSettingsSection app = config.AppSettings;
     app.Settings["key"].Value = "valuemodify";
     config.Save(ConfigurationSaveMode.Modified);
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     Configuration config = WebConfigurationManager.OpenWebConfiguration(null);
     AppSettingsSection app = config.AppSettings;
     app.Settings.Remove("key");
     config.Save(ConfigurationSaveMode.Modified);
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      Configuration config = WebConfigurationManager.OpenWebConfiguration(Request.ApplicationPath);
ConnectionStringsSection conSection = (ConnectionStringsSection)config.GetSection("connectionStrings");
conSection.ConnectionStrings[Request["type"].ToString()].ConnectionString = Request["connstr"];
config.Save(ConfigurationSaveMode.Modified);
 XmlDocument xmldoc = new XmlDocument();
            string filename = Common.FilePath("../web.config");
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