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/// 
    /// 修改配置文件中的连接字符串    /// 
    /// 服务器名称    /// 用户ID    /// 密码    /// 数据库名称    protected bool ReadXml(string server, string userid, string password, string database)    {        try        {            string sqlconstring = "Data Source=" + server + "; User ID=" + userid + "; Password=" + password + "; Initial Catalog=" + database;            string path = HttpContext.Current.Server.MapPath("~/web.Config");            System.Xml.XmlDocument doc = new System.Xml.XmlDocument();            doc.Load(path);            System.Xml.XmlNode node = doc.SelectSingleNode("configuration/connectionStrings/add");            System.Xml.XmlElement eml = (System.Xml.XmlElement)node;            eml.SetAttribute("connectionString", sqlconstring);            doc.Save(path);            return true;        }        catch        {            return false;        }    }

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2012.12.13添加，修改WinForm的配置文件：

public class AppSettings    {        public static string AppConfig()        {            return System.IO.Path.Combine(Application.StartupPath, "xx.exe.config");//xx.exe.config实际为app.config生成后文件        }        public static string GetValue(string appKey)        {            XmlDocument xDoc = new XmlDocument();            try            {                xDoc.Load(AppSettings.AppConfig());                XmlNode xNode = xDoc.SelectSingleNode("//appSettings");                XmlElement xElem = (XmlElement)xNode.SelectSingleNode("//add[@key='" + appKey + "']");                               if (xElem != null)                    return xElem.GetAttribute("value");                else                    return "";            }            catch             {                return "";            }        }        public static void SetValue(string AppKey, string AppValue)        {            XmlDocument xDoc = new XmlDocument();            xDoc.Load(AppSettings.AppConfig());            XmlNode xNode = xDoc.SelectSingleNode("//appSettings");            XmlElement xElem1 = (XmlElement)xNode.SelectSingleNode("//add[@key='" + AppKey + "']");                                        if (xElem1 != null)            {                xElem1.SetAttribute("value", AppValue);            }            else            {                XmlElement xElem2 = xDoc.CreateElement("add");                xElem2.SetAttribute("key", AppKey);                xElem2.SetAttribute("value", AppValue);                xNode.AppendChild(xElem2);            }            xDoc.Save(AppSettings.AppConfig());        }    }

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