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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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