在ASP.NET中找不到Web传输问题

如何解决在ASP.NET中找不到Web传输问题

我正在尝试使用SendGrid实施密码恢复。我使用的是互联网上常见的示例，但此行有问题

var transportWeb = new Web(credentials);

编译器指出未找到Web。我通过Nuget软件包安装了SendGrid。有人知道为什么这个问题存在吗？

public class EmailService : IIdentityMessageService
{
        public async Task SendAsync(IdentityMessage message)
        {
            await configSendGridasync(message);
        }

        // Use NuGet to install SendGrid (Basic C# client lib) 
        private async Task configSendGridasync(IdentityMessage message)
        {
            var myMessage = new SendGridMessage();
            myMessage.AddTo(message.Destination);
            myMessage.From = new MailAddress(
                                "mymail@gmail.com","Joe S.");
            myMessage.Subject = message.Subject;
            myMessage.PlainTextContent = message.Body;
            myMessage.HtmlContent = message.Body;

            var credentials = new NetworkCredential(
                       ConfigurationManager.AppSettings["mailAccount"],ConfigurationManager.AppSettings["mailPassword"]
                       );

            // Create a Web transport for sending email.
            var transportWeb = new Web(credentials);

            // Send the email.
            if (transportWeb != null)
            {
                await transportWeb.DeliverAsync(myMessage);
            }
            else
            {
                Trace.TraceError("Failed to create Web transport.");
                await Task.Fromresult(0);
            }
        }
}