名称“ txtname”在当前上下文中不存在

Question

I am using visual studio 2010. When i run the asp page it shows the errors "The name 'txtname' doest not exists in the current context" . I am new in C# programming needs help. I am using all the defined variables but i am still confused why it is giving errors.

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

When .cs file name in Code behind attribute does not match , then only this kind of error can occur.

Check your code behind file name and Inherits property on the @Page directive , make sure they both match.

Or it seems that you have copy and pasted the control or code related to it.

This often creates problem in designer file.

You can delete that textbox and once again drag-drop it on your app from toolbar

Answer 2

如果它是常规的html控件，则在txtName控件中添加runat="server" 。

Answer 3

I know this is and old question. I got the same problem after copying few divs in a seperate place. This might be useful to anyone in future. Just remove runat="server" attribute of the relevenat tag and again insert it. It worked for me 100%.