C#

foreach(var value in enum){
   list.Add(new SelectListItem(){
       Text = value.ToString(),
       Value =  ((int)value).ToString()
   });
}

enum States{
       Running,
       Stoped,
       Paused
}

/* Program Created by
 * Name: Sai Ayilavarapu
 * Form Description: To create and validate registration form
 * Things thats are mandatory: username, email, password, security question, security answer
 */

using System;
using System.Configuration;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.ApplicationServices;
using System.Data;
using System.Data.SqlClient;
using DataClass;


public partial class Account_Register : System.Web.UI.Page
{

    ConnectionClass newobj = new ConnectionClass();
    protected void Page_Load(object sender, EventArgs e)
    {
        //RegisterUser.ContinueDestinationPageUrl = Request.QueryString["ReturnUrl"];
    }
  
    protected void CreateUserButton_Click(object sender, EventArgs e)
    {
        
        string F_Name = txtFirstName.Text;
        string L_Name = txtLastName.Text;
        string Address = txtAddress.Text;
        string City = txtCity.Text;
        string State = txtState.Text;
        string Zip = txtZipCode.Text;
        string DOB = txtDOB.Text;
        string Phone = txtPhone.Text;
        string email = txtEmail.Text;
        string User_Name = txtUserName.Text;
        string Password = txtPassword.Text;
        string PasswordQuestion = txtPasswordQuestion.Text;
        string PasswordAnswer = txtPasswordAnswer.Text;


        MembershipCreateStatus createStatus;
        MembershipUser newUser = Membership.CreateUser(txtUserName.Text, txtPassword.Text, txtEmail.Text, txtPasswordQuestion.Text, txtPasswordAnswer.Text, true, out createStatus);
        switch (createStatus)
        {
            case MembershipCreateStatus.Success:
                string UserId = newUser.ProviderUserKey.ToString(); //create provider key?
                lblCreateAccount.Text = "The user account was successfully created!";
                break;
            case MembershipCreateStatus.DuplicateUserName:
                lblCreateAccount.Text = "There already exists a user with this username.";
                break;

            case MembershipCreateStatus.DuplicateEmail:
                lblCreateAccount.Text = "There already exists a user with this email address.";
                break;
            case MembershipCreateStatus.InvalidEmail:
                lblCreateAccount.Text = "There email address you provided in invalid.";
                break;
            case MembershipCreateStatus.InvalidAnswer:
                lblCreateAccount.Text = "There security answer was invalid.";
                break;
            case MembershipCreateStatus.InvalidPassword:
                lblCreateAccount.Text = "The password you provided is invalid. It must be seven characters long and have at least one non-alphanumeric character.";

                break;
            default:
                lblCreateAccount.Text = "There was an unknown error; the user account was NOT created.";
                break;

                
        }
        string userid;
        if (newUser != null)
                {
                        
             userid = newobj.ProviderUserKey.ToString(); // it shows the error here
             newobj.Insert(userid, F_Name, L_Name, Address, City, State, Zip, DOB, Phone,
              email, User_Name, Password, PasswordQuestion, PasswordAnswer);

                }


 
    }

}

using System;

using System.Data;

using System.Configuration;
using System.Collections.Specialized;
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;

namespace DataClass
{
    public class ConnectionClass
    {
        string connStr = ConfigurationManager.ConnectionStrings["aspnetdbConnectionString"].ToString();
        public ConnectionClass()
        {  
            // Add Constructor Logic
            
        }
        
        public int Insert (string U_ID, string F_Name, string L_Name, string Address, string City, string State, string Zip, string DOB, string Phone,
            string email, string User_Name, string Password, string PasswordQuestion, string PasswordAnswer)
        {

            SqlConnection con = new SqlConnection(connStr);
            con.Open();
            SqlCommand cmd = new SqlCommand("user_membership", con);
            cmd.CommandType = CommandType.StoredProcedure;
            try {
            
            cmd.Parameters.Add("@UserId", SqlDbType.UniqueIdentifier).Value = new Guid(U_ID);
            cmd.Parameters.AddWithValue("@F_Name", F_Name);
            cmd.Parameters.AddWithValue("@L_Name", L_Name);
            cmd.Parameters.AddWithValue("@Address", Address);
            cmd.Parameters.AddWithValue("@City", City);
            cmd.Parameters.AddWithValue("@State", State);
            cmd.Parameters.AddWithValue("@Zip", Zip);
            cmd.Parameters.AddWithValue("@DOB", DOB);
            cmd.Parameters.AddWithValue("@Phone", Phone);
            cmd.Parameters.AddWithValue("@email", email);
            cmd.Parameters.AddWithValue("@User_Name", User_Name);
            cmd.Parameters.AddWithValue("@Password", Password);
            cmd.Parameters.AddWithValue("@PasswordQuestion", PasswordQuestion);
            cmd.Parameters.AddWithValue("@PasswordAnswer", PasswordAnswer);
            return cmd.ExecuteNonQuery();

            }
            catch { throw; }
            finally 
            {
               
                con.Dispose();
                con.Close();
                cmd.Dispose();
            }
            

        }

        public DataTable Load(string F_Name, string L_Name, string Address, string City, string State, string Zip, string DOB, string Phone,
            string email, string User_Name, string Password, string PasswordQuestion, string PasswordAnswer)
        {
            SqlConnection conn = new SqlConnection(connStr);

            SqlCommand cmd = new SqlCommand("user_membership", conn);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            da.SelectCommand.CommandType = CommandType.StoredProcedure;

            DataSet ds = new DataSet();
            try
            {
                // da.GetFillParameters();
                cmd.Parameters.AddWithValue("@F_Name", F_Name);
                cmd.Parameters.AddWithValue("@L_Name", L_Name);
                cmd.Parameters.AddWithValue("@Address", Address);
                cmd.Parameters.AddWithValue("@City", City);
                cmd.Parameters.AddWithValue("@State", State);
                cmd.Parameters.AddWithValue("@Zip", Zip);
                cmd.Parameters.AddWithValue("@DOB", DOB);
                cmd.Parameters.AddWithValue("@Phone", Phone);
                cmd.Parameters.AddWithValue("@email", email);
                cmd.Parameters.AddWithValue("@User_Name", User_Name);
                cmd.Parameters.AddWithValue("@Password", Password);
                cmd.Parameters.AddWithValue("@PasswordQuestion", PasswordQuestion);
                cmd.Parameters.AddWithValue("@PasswordAnswer", PasswordAnswer);
                da.Fill(ds);
                return ds.Tables[0];
            }
            catch
            {
                throw;
            }
            finally
            {
                ds.Dispose();
                da.Dispose();
                conn.Close();

                conn.Dispose();
            }
        }

    }
}

namespace TaxCalculator
{
    public class ProgressiveTax
    {
        //double amount = 0;
        readonly double limit1 = 0,//define the tax variables and their upper and lower limits
        limit2 = 10164, limit3 = 10165,
        limit4 = 19740, limit5 = 19741,
        limit6 = 29316, limit7 = 29317,
        limit8 = 38892;//, limit9 = 38893;

        private double taxedAmount = 0;//holdes the total amount that has been taxed

        private double ComputeTax(double grossPay)//accessible only within this class and not to outside components
        {
            //If amount >= limit1 And amount <= limit2 Then
            if ((grossPay >= limit1) && (grossPay <= limit2))//10% taxation
            {
                taxedAmount = grossPay * 0.1;
                return taxedAmount;
            }
            else if ((grossPay >= limit3) && (grossPay <= limit4))//15% taxation
            {
                //TheTax = TheTax(limit2) + ((amount - limit2) * 15 / 100)
                taxedAmount = ComputeTax(limit2) + ((grossPay - limit2) * 0.15);
                return taxedAmount;
            }
            else if ((grossPay >= limit5) && (grossPay <= limit6))//20% taxation
            {
                //TheTax = TheTax(limit4) + ((amount - limit4) * 20 / 100)
                taxedAmount = ComputeTax(limit4) + ((grossPay - limit4) * 0.2);
                return taxedAmount;
            }
            else if ((grossPay >= limit7) && (grossPay <= limit8))//25% taxation
            {
                //TheTax = TheTax(limit6) + ((amount - limit6) * 25 / 100)
                taxedAmount = ComputeTax(limit6) + ((grossPay - limit6) * 0.25);
                return taxedAmount;
            }
            else if ((grossPay > limit8))//anything above the 8 limit is taxed at 30%
            {
                //TheTax = TheTax(limit8) + ((amount - limit8) * 30 / 100)
                taxedAmount = ComputeTax(limit8) + ((grossPay - limit8) * 0.3);
                return taxedAmount;
            }
            return 0;
        }

        public double ComputeNet(double netSalary = 0)
        {
            netSalary = netSalary - ComputeTax(netSalary);//get the differfence between the gross salary and the taxed amount
            return netSalary;
        }

        public double GetTax(double salaryAmount)
        {
            salaryAmount = ComputeTax(salaryAmount);
            return salaryAmount;
        }
    }
}