修改web.config的操作

需引入System.Configuration.DLL
引入名門空間
using System.Configuration;
using System.Web.Configuration;

            
            Configuration webconfig = WebConfigurationManager.OpenWebConfiguration("~/");
            ConfigurationSectionGroup node_conn = webconfig.SectionGroups["configuration"];
            ConnectionStringsSection connSec = (ConnectionStringsSection)node_conn.Sections["connectionStrings"];
            connSec.ConnectionStrings.Add(new ConnectionStringSettings("Name","connectionString","providerName"));
            webconfig.Save();