Insert Data Into Database

What is wrong with this code
the dropdowlist mainly

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;

public partial class NewAccount : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void NaccountButton_Click(object sender, EventArgs e)
    {
        if (Page.IsValid)
        {
            //Define data objects
            SqlConnection conn;
            SqlCommand comm;
            //read from web config
            string connectionString = ConfigurationManager.ConnectionStrings["OneBank"].ConnectionString;
            //Initialize connection
            conn = new SqlConnection(connectionString);
            //create command
            comm =new SqlCommand(
                "INSERT INTO Customer (FirstName, LastName, Street, City, State," +
                 "Zip, Phone, Payee,AccountType)" +
                 "VALUES(FirstName, LastName, Street, City," +
                 "State, Zip, Phone, Payee,AccountType)", conn);
            //add parameters
            comm.Parameters.Add("@FirstName", System.Data.SqlDbType.NVarChar, 50);
            comm.Parameters["@FirstName"].Value=Firstname.Text;

            comm.Parameters.Add("@LastName", System.Data.SqlDbType.NVarChar, 50);
            comm.Parameters["@LastName"].Value=lastname.Text;

            comm.Parameters.Add("@Street", System.Data.SqlDbType.NVarChar, 50);
            comm.Parameters["@Street"].Value=street.Text;

            comm.Parameters.Add("@City", System.Data.SqlDbType.NVarChar, 50);
            comm.Parameters["@City"].Value=city.Text;

            comm.Parameters.Add("@State", System.Data.SqlDbType.NVarChar, 50);
            comm.Parameters["@State"].Value=state.Text;

            comm.Parameters.Add("@Phone", System.Data.SqlDbType.Int);
            comm.Parameters["@Phone"].Value=phone.Text;



           comm.Parameters.Add("@AccountType", System.Data.SqlDbType.NVarChar, 50);
           comm.Parameters["AccountType"].Value = dropdownlist1.SelectedValue.ToString();
            //Enclose database in try catc finally

            try
            {
                //open connection
                conn.Open();
                //execute the command
                comm.ExecuteNonQuery();
                //reload query
                Response.Redirect("NewAccount.aspx");
            }
            catch
            {
                //Display error
              Errormessage.Text=
                    "Error submitting request!";
            }
            finally
            {
                conn.Close();
            }

        }
    }
}


 

This is the table where thisis going

customer                      
-------------                    
customerID pk generated automatically
firtsname                            
lastname                            
street                                                              
city                                                                      
state
zip
phone
accountType