Table of Contents

• General Info
• Implementation
• Technologies
• Setup
• Contributing
• License

General Info

A simple application on how to set expiration date (trial version) in a web application using ASP.NET

Implementation

The steps as following are the implementation for setting expiration date (trial version) in a web application using ASP.NET.

Step 1: Set the Entry Point of the Application Conditional which is Based on the Expired Date

using System;
using System.Globalization;

namespace WebApplication_WithExpiration
{
    public partial class Home : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            string expiredDate = System.Configuration.ConfigurationManager.AppSettings["ExpiredDate"].ToString();
            DateTime date = DateTime.ParseExact(expiredDate, "yyyy-MM-dd HH:mm:ss tt", CultureInfo.InvariantCulture);

            if (date <= DateTime.Now)
            {                
                Response.Redirect("Expiration.aspx");
            }
        }    
    }
 }

Step 2: Configure the Web.config Appsettings

<appSettings>
    <add key="ExpiredDate" value="2019-12-31 23:59:59 PM" />
</appSettings>  

Step 3: Encrypt the Web.config Appsettings
Please run the following command as administrator in Visual Studio command prompt:

aspnet_regiis.exe -pef "appSettings" "web.config file Path" -prov "DataProtectionConfigurationProvider"

Step 4: Decrypt the Web.config Appsettings for Resetting the Expired Date, If Necessary
Please run the following command as administrator in Visual Studio command prompt:

aspnet_regiis.exe -pdf "appSettings" "web.config file Path"

Technologies

This application is created with:

• Visual Studio 2017
• C#
• ASP.NET

Setup

To clone and run this repository you will need Git installed on your computer. From your command line:

# Clone this repository
$ git clone https://github.com/sumuongit/asp-regiis-webconfig-encryption-expiration.git
# Go into the repository
$ cd asp-regiis-webconfig-encryption-expiration

Contributing

• Fork the repository
• Create a topic branch
• Implement your feature or bug fix
• Add, commit, and push your changes
• Submit a pull request

License

MIT License