after running code , this error show i am using window 10, C#, Asp.net, Bootstrap, JavaScript, Html lang

Question

Answer 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.OleDb;
using System.Configuration;
using System.Net.Mail;
using System.Net.Sockets;



namespace Datamationinternational
{
    public partial class GuestRegistration : System.Web.UI.Page
    {
       
        string strConnection;
        OleDbConnection conn;

        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btnsubmit_Click(object sender, EventArgs e)
        {
            string valid = string.Empty;
            if (txtname.Text == "" || txtcity.Text == "" || ddlcountry.Text == "" || txtphone.Text == "" || txtemail.Text == "")
            {
                //Page.ClientScript.RegisterStartupScript(this.GetType(), "scriptkey", "alert('Enter Name');");

            }
            else
            {
                try
                {
                    strConnection = ConfigurationManager.ConnectionStrings["dbconnection"].ConnectionString.ToString();
                    conn = new OleDbConnection(strConnection);

                    string ck1val, ck2val, ck3val, ck4val, ck5val, ck6val, ck7val, ck8val, ck9val, ck10val, ck11val, ck12val, ck13val, ck14val, ck15val, ck16val, ck17val, ck18val;

                    if (ck1.Checked == true)
                    {
                        ck1val = "1";
                    }
                    else
                    {
                        ck1val = "0";
                    }
                    if (ck2.Checked == true)
                    {
                        ck2val = "1";
                    }
                    else
                    {
                        ck2val = "0";
                    }
                    if (ck3.Checked == true)
                    {
                        ck3val = "1";
                    }
                    else
                    {
                        ck3val = "0";
                    }
                    if (ck4.Checked == true)
                    {
                        ck4val = "1";
                    }
                    else
                    {
                        ck4val = "0";
                    }
                    if (ck5.Checked == true)
                    {
                        ck5val = "1";
                    }
                    else
                    {
                        ck5val = "0";
                    }
                    if (ck6.Checked == true)
                    {
                        ck6val = "1";
                    }
                    else
                    {
                        ck6val = "0";
                    }
                    if (ck7.Checked == true)
                    {
                        ck7val = "1";
                    }
                    else
                    {
                        ck7val = "0";
                    }
                    if (ck8.Checked == true)
                    {
                        ck8val = "1";
                    }
                    else
                    {
                        ck8val = "0";
                    }
                    if (ck9.Checked == true)
                    {
                        ck9val = "1";
                    }
                    else
                    {
                        ck9val = "0";
                    }
                    if (ck10.Checked == true)
                    {
                        ck10val = "1";
                    }
                    else
                    {
                        ck10val = "0";
                    }
                    if (ck11.Checked == true)
                    {
                        ck11val = "1";
                    }
                    else
                    {
                        ck11val = "0";
                    }
                    if (ck12.Checked == true)
                    {
                        ck12val = "1";
                    }
                    else
                    {
                        ck12val = "0";
                    }
                    if (ck13.Checked == true)
                    {
                        ck13val = "1";
                    }
                    else
                    {
                        ck13val = "0";
                    }
                    if (ck14.Checked == true)
                    {
                        ck14val = "1";
                    }
                    else
                    {
                        ck14val = "0";
                    }
                    if (ck15.Checked == true)
                    {
                        ck15val = "1";
                    }
                    else
                    {
                        ck15val = "0";
                    }
                    if (ck16.Checked == true)
                    {
                        ck16val = "1";
                    }
                    else
                    {
                        ck16val = "0";
                    }
                    if (ck17.Checked == true)
                    {
                        ck17val = "1";
                    }
                    else
                    {
                        ck17val = "0";
                    }
                    if (ck18.Checked == true)
                    {
                        ck18val = "1";
                    }
                    else
                    {
                        ck18val = "0";
                    }


                    string strquery = "Insert into GuestRegistration(Name, JobTitle, Company, Address, City, State, Zip, Country, Phone, Email, OrganizationIndustry, OrganizationSize, FindOutDatamation, Datamation_Newsletters, Application_Development, Learn_About_DataMation, InfornationProcessingManagement, ScanningDataCapture, DocumentRecordManagement, ContentDocumentManagement, DigitalDirectPromotions, CMR, MarketResearch, BusinessProcessManagement, SocioEconomicResearch, ConsultingServices, FieldSurveys, ProcessImprovement, TranningCapacity, EvaluationsAssesment, DataAnalytics, Message) Values ('" + txtname.Text + "', '" + txtjobtitle.Text + "', '" + txtcompany.Text + "', '" + txtAddress.Text + "', '" + txtcity.Text + "', '" + ddlstate.SelectedItem.Text + "', '" + txtzip.Text + "', '" + ddlcountry.SelectedItem.Text + "', '" + txtphone.Text + "', '" + txtemail.Text + "', '" + txtorgindustry.Text + "', '" + txtorgsize.Text + "', '" + txtfindout.Text + "', '" + ck1val + "','" + ck2val + "','" + ck3val + "','" + ck4val + "','" + ck5val + "','" + ck6val + "','" + ck7val + "','" + ck8val + "','" + ck9val + "','" + ck10val + "','" + ck11val + "','" + ck12val + "','" + ck13val + "','" + ck14val + "','" + ck15val + "','" + ck16val + "','" + ck17val + "','" + ck18val + "','" + txtmessage.Text + "')";
                    //string strquery = "Insert into GuestRegistration(Name, JobTitle, Company, Address, City, State, Zip, Country, Phone, Email, OrganizationIndustry, FindOutDatamation) Values ('" + txtname.Text + "', '" + txtjobtitle.Text + "', '" + txtcompany.Text + "', '" + txtAddress.Text + "', '" + txtcity.Text + "', '" + ddlstate.SelectedItem.Text + "', '" + txtzip.Text + "', '" + ddlcountry.SelectedItem.Text + "', '" + txtphone.Text + "', '" + txtemail.Text + "', '" + txtorgindustry.Text + "', '" + txtorgsize.Text + "', '" + txtfindout.Text + "')";
                    conn.Open();
                    OleDbCommand cmd = new OleDbCommand(strquery, conn);
                    cmd.ExecuteNonQuery();
                    valid = "Y";

                }
                catch (Exception ex)
                {
                    lblstatus.Text = ex.Message;
                    lblstatus.ForeColor = System.Drawing.Color.Red;
                    
                }

                finally
                {
                    conn.Close();
                }
            }
            if (valid == "Y")
            {
                lblname.Text = "Thank You" + " " + txtname.Text +".";
                lblstatus.Text = "Your message has been sent successfully.";
                lblstatus.ForeColor = System.Drawing.Color.Green;

                sendEmail();
                clearField();
            }
            
        }

        public void clearField()
        {
            txtname.Text = "";
            txtjobtitle.Text = "";
            txtcompany.Text = "";
            txtAddress.Text = "";
            txtcity.Text = "";
            ddlstate.Text = "State";
            txtzip.Text = "";
            ddlcountry.Text = "India";
            txtphone.Text = "";
            txtemail.Text = "";
            txtorgindustry.Text = "";
            txtorgsize.Text = "";
            txtfindout.Text = "";
            ck1.Checked = false;
            ck2.Checked = false;
            ck3.Checked = false;
            ck4.Checked = false;
            ck5.Checked = false;
            ck6.Checked = false;
            ck7.Checked = false;
            ck8.Checked = false;
            ck9.Checked = false;
            ck10.Checked = false;
            ck11.Checked = false;
            ck12.Checked = false;
            ck13.Checked = false;
            ck14.Checked = false;
            ck15.Checked = false;
            ck16.Checked = false;
            ck17.Checked = false;
            ck18.Checked = false;
            txtmessage.Text = "";
        }

        public void sendEmail()
        {
            try
            {
                MailMessage mail = new MailMessage();
                mail.To.Add("******@datamationinternational.com.Text");
                mail.From = new MailAddress("******@datamationinternational.com");
                mail.Subject = "Guest Registration at DataMation";
                string Body = "Thank You" + " " + txtname.Text + " " + "For Registration at DataMation Group.";
                //string Body = "@<table><tr><td>Thank You " + txtname.Text + "</td></tr><tr><td> Thanks & Regards</td></tr><tr><td> DataMation Group</td></tr></table>";
                mail.Body = Body;
                SmtpClient client =new SmtpClient();
                smtp.Host = "touran.websitewelcome.com";
                smtp.Port = 587;
                smtp.UseDefaultCredentials = true;
                smtp.Credentials = new System.Net.NetworkCredential("******@datamationinternational.com", "datamation361");
                smtp.EnableSsl = true;
                smtp.Send(mail);
                lblstatus.Text = "Email has been sent successfully !";
                lblstatus.ForeColor = System.Drawing.Color.Green;
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {

            }
        }
    }
}

Answer 2

Hi @Rupa Kumari

Please check whether the textname under the aspx page has runat="server"

Please check if aspx.designer .cs have a declaration for this control.

Generally, this problem is caused by the absence of runat="server" in the control under the page.

Best Regards

Qi You

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Answer 3

Hum, by just chance, looking at your project explore, something does not seem right.

This:

I wonder if you opened this as a "web site", or that this was a web site, as opposed to a web site project. But, your tree view don't look correct. Try hitting the ">" and expand that project explore on the right.

You should see the file(s) nested like this:

So, your designer files don't seem to be nested.

Did this site ever work at one time?