动态修改Web.config中数据库连接字符串的方法

public void writeConfig(string name, string ConnectionString)
    {
        Configuration config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration(System.Web.HttpContext.Current.Request.ApplicationPath);

        ConnectionStringsSection con = (ConnectionStringsSection)config.GetSection("connectionStrings");

        con.ConnectionStrings[name].ConnectionString = ConnectionString;

        Response.Write("<script>alert ('成功');</script>");

        config.Save();
    }