Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36 Edg/81.0.416.72
if (0 <= Request.UserAgent.IndexOf("Edg/")){
/* Microsoft Edge(新) である */
}
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.10240
if (0 <= Request.UserAgent.IndexOf("Edge/")){
/* Microsoft Edge(旧) である */
}