How to change ASP.NET membership database connection string dynamically?

By reflection:

        private void SetProviderConnectionString(string connectionString)
        {
            // Set private property of Membership, Role and Profile providers.
            FieldInfo connectionStringField = Membership.Provider.GetType().GetField("_sqlConnectionString", BindingFlags.Instance | BindingFlags.NonPublic); 
            if (connectionStringField != null)
                connectionStringField.SetValue(Membership.Provider, connectionString);

            FieldInfo roleField = Roles.Provider.GetType().GetField("_sqlConnectionString", BindingFlags.Instance | BindingFlags.NonPublic);
            if (roleField != null)
                roleField.SetValue(Roles.Provider, connectionString);

            FieldInfo profileField = ProfileManager.Provider.GetType().GetField("_sqlConnectionString", BindingFlags.Instance | BindingFlags.NonPublic);
            if (profileField != null) 
                profileField.SetValue(ProfileManager.Provider, connectionString);
        }

How to call WCF service in ASP.NET ?

Add following setting in web.config:

http://msdn.microsoft.com/en-ca/library/bb763177(v=vs.90).aspx

How to solve "CustomError for 403 Forbidden not working"?

In IIS 7 add following settings into web.config

How to use QR code in ASP.NET MVC?

The lib is: QRCODENET
http://qrcodenet.codeplex.com/

public ActionResult QRImage(int id)
        {
            string url = string.Format("http://myevents.apphb.com/event/details/{0}", id);
            QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.H);
            QrCode qrCode = qrEncoder.Encode(url);

            GraphicsRenderer renderer = new GraphicsRenderer(new FixedModuleSize(5, QuietZoneModules.Two), Brushes.Black, Brushes.White);
            MemoryStream ms = new MemoryStream();
            renderer.WriteToStream(qrCode.Matrix, ImageFormat.Png, ms);
            byte[] image = ms.ToArray(); ;
            return File(image, "image/png");
        }

Reverse polish notation in C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Globalization;
using System.Threading;
 
namespace RPNEvaluator
{
    class RPNEvaluator
    {
        static void Main(string[] args)
        {
            Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
 
            string rpn = "3 4 2 * 1 5 - 2 3 ^ ^ / +";
            Console.WriteLine("{0}\n", rpn);
 
            decimal result = CalculateRPN(rpn);
            Console.WriteLine("\nResult is {0}", result);
        }
 
        static decimal CalculateRPN(string rpn)
        {
            string[] rpnTokens = rpn.Split(' ');
            Stack stack = new Stack();
            decimal number = decimal.Zero;
 
            foreach (string token in rpnTokens)
            {
                if (decimal.TryParse(token, out number))
                {
                    stack.Push(number);
                }
                else
                {
                    switch (token)
                    {
                        case "^":
                        case "pow":
                            {
                                number = stack.Pop();
                                stack.Push((decimal)Math.Pow((double)stack.Pop(), (double)number));
                                break;
                            }
                        case "ln":
                            {
                                stack.Push((decimal)Math.Log((double)stack.Pop(), Math.E));
                                break;
                            }
                        case "sqrt":
                            {
                                stack.Push((decimal)Math.Sqrt((double)stack.Pop()));
                                break;
                            }
                        case "*":
                            {
                                stack.Push(stack.Pop() * stack.Pop());
                                break;
                            }
                        case "/":
                            {
                                number = stack.Pop();
                                stack.Push(stack.Pop() / number);
                                break;
                            }
                        case "+":
                            {
                                stack.Push(stack.Pop() + stack.Pop());
                                break;
                            }
                        case "-":
                            {
                                number = stack.Pop();
                                stack.Push(stack.Pop() - number);
                                break;
                            }
                        default:
                            Console.WriteLine("Error in CalculateRPN(string) Method!");
                            break;
                    }
                }
                PrintState(stack);
            }
 
            return stack.Pop();
        }
 
        static void PrintState(Stack stack)
        {
            decimal[] arr = stack.ToArray();
 
            for (int i = arr.Length - 1; i >= 0; i--)
            {
                Console.Write("{0,-8:F3}", arr[i]);
            }
 
            Console.WriteLine();
        }
    }
}