'dbconnection' could not be found

The type or namespace name 'dbconnection' could not be found (are you missing a using directive or an assembly reference?)<br />

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Data.Common;
using System.Collections;

public partial class Enquiry_Ind : System.Web.UI.Page
{
    dbconnection dbcon = new dbconnection();

    protected void Page_Load(object sender, EventArgs e)
    {      
        
    }
    protected void Ind_Submit_Click(object sender, EventArgs e)
    {
        dbcon.opencon();
       
        SqlCommand cmd = new SqlCommand("Insert into Indivisual(Name,Age,Mobile_No,Email_Id,Occupation,Location) values('" + Ind_Name.Text + "','" + Ind_Age.Text + "','" + Ind_Mobil_No.Text + "', '" + Ind_Email_Id.Text + "'  ,'" + Ind_Occ.SelectedItem.Value + "','"+Ind_Loc.SelectedItem.Value+"')", dbcon.con);
        cmd.ExecuteNonQuery();
        dbcon.closecon();
        SqlCommand cmd1 = new SqlCommand("select max(id) from login_master", dbcon.con );
        int id1 = Convert.ToInt32(cmd1.ExecuteScalar());
        id1 = id1 + 1;
        string name = Ind_Name.Text;
        string user_id;
        string occ = Ind_Occ.SelectedValue;

        if (Ind_Occ.SelectedValue == "Business/Entrepreneur")
        {
            occ = occ.Substring(0, 2) + occ.Substring(9, 2);
        }
        else if (Ind_Occ.SelectedValue == "Service-Private")
        {
            occ = occ.Substring(0, 2) + occ.Substring(8, 2);
        }
        else if (Ind_Occ.SelectedValue == "HouseWife")
        {
            occ = occ.Substring(0, 2) + occ.Substring(5, 2);
        }
        else if (Ind_Occ.SelectedValue == "Service-Govt/Psu/Defence/Army/Armed Force/Civil Services")
        {
            occ = occ.Substring(0, 2) + occ.Substring(7, 2);
        }
        else
        {
            occ = occ.Substring(0, 4);
        }
        user_id = name.Substring(0, 3) + occ + id1;
        string allowedChars = "abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ0123456789!@$?_-";
        char[] chars = new char[6];
        Random rd = new Random();
        for (int i = 0; i < 6; i++)
        {
            chars[i] = allowedChars[rd.Next(0, allowedChars.Length)];
        }
        string individual = "Individual";
        string pass = new string(chars);
        Session["user"] = user_id.ToString();
        Session["passwd"] = pass;
        SqlCommand cmd2 = new SqlCommand("INSERT INTO login_master (id,User_id,password,user_type) VALUES ( '" + id1 + "' , '" + user_id + "', '" + pass + "', '" + individual + "' )", dbcon .con );
        cmd2.ExecuteNonQuery();
        Session.Add("LoginID", user_id);
        Session.Add("Password", pass);
        Server.Transfer("~/Enquiry/Thank u.aspx");
        
    
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {

    }
}