名稱“ txtname”在當前上下文中不存在

Question

我正在使用Visual "The name 'txtname' doest not exists in the current context" 。當我運行asp頁面時，它顯示錯誤"The name 'txtname' doest not exists in the current context" 。 我是C＃編程新手，需要幫助。 我正在使用所有定義的變量，但是我仍然很困惑為什么它會產生錯誤。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net.Mail;
using System.Net;
namespace WebApplication1
{
    public partial class contactus : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        protected void btnSubmit_Click(object sender, EventArgs e)
        {
            try
            {
                //Create the msg object to be sent
                MailMessage msg = new MailMessage();
                //Add your email address to the recipients
                msg.To.Add("myinfo@yahoo.com");
                //Configure the address we are sending the mail from
                MailAddress address = new MailAddress("abc@gmail.com");
                msg.From = address;
                //Append their name in the beginning of the subject
                msg.Subject = txtName.Text + " :  " + txtName1.Text;
                msg.Body = txtMessage.Text;

                //Configure an SmtpClient to send the mail.
                SmtpClient client = new SmtpClient("smtp.gmail.com", 587);
                client.EnableSsl = true; //only enable this if your provider requires it
                //Setup credentials to login to our sender email address ("UserName", "Password")
                NetworkCredential credentials = new NetworkCredential("abc@gmail.com", "paswword");
                client.Credentials = credentials;

                //Send the msg
                client.Send(msg);

                //Display some feedback to the user to let them know it was sent
                lblResult.Text = "Your email has been received, you will be contacted soon by our representative if required.";

                //Clear the form
                txtName.Text = "";
                txtName1.Text = "";
                txtMessage.Text = "";
            }
            catch
            {
                //If the message failed at some point, let the user know
                lblResult.Text = "Your message failed to send, please try again.";
            }
        }

    }
}

Answer 1

當“身后代碼”中的.cs文件名不匹配時，僅會發生這種錯誤。

檢查@Page directive上文件名和Inherits屬性后面的代碼，確保它們匹配。

或者似乎您已經復制並粘貼了與之相關的控件或代碼。

這通常會在designer文件中產生問題。

您可以刪除該文本框，然后再次將其從toolbar拖放到您的應用中

Answer 2

如果它是常規的html控件，則在txtName控件中添加runat="server" 。

Answer 3

我知道這是老問題了。 在單獨的地方復制了幾個div后，我遇到了同樣的問題。 這對將來的任何人都可能有用。 只需刪除relevenat標記的runat =“ server”屬性，然后再次插入即可。 它為我工作了100％。