保存web.config文件(转载)

string appSetting = txtAppSetting.Text;//appSetting子节点值

string connectionString = txtConnectionString.Text;//连接字符串

string key = txtKey.Text;//appSetting子节点Key

string connectionName = txtConnectionName.Text;//连接Name

ConfigurationOperator op = new ConfigurationOperator(); 
op.SetAppSetting(key, appSetting); 
op.SetConnectionString(connectionName, connectionString); 
op.Save();

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原文链接：http://edu.codepub.com/2010/0803/24812_8.php