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Ultimate .NET Credit Card Utility Class

, 29 Aug 2007
A powerfully simple .NET utility class for validating and testing credit card numbers in C# and VB.
UltimateCreditCardUtilityCS_src.zip
CredCardUtilityTestsCS
CreditCardUtilityTests
bin
Debug
CreditCardUtility.dll
CreditCardUtilityTest.dll
nunit.framework.dll
CreditCardUtilityTests.csproj.user
Properties
CreditCardTestSiteCS
Bin
CreditCardUtility.dll
RadAjax.Net2.dll
RadInput.Net2.dll
images
innerBkgnd.png
loading4.gif
pageBkgn.jpg
UltimateCreditCardUtility.gif
CreditCardUtilityCS
bin
Debug
CreditCardUtility.dll
CreditCardUtility.csproj.user
Properties
UltimateCreditCardUtilityVB_src.zip
CreditCardTestSiteVB
Bin
CreditCardUtility.dll
RadAjax.Net2.dll
RadInput.Net2.dll
images
innerBkgnd.png
loading4.gif
pageBkgn.jpg
UltimateCreditCardUtility.gif
CreditCardUtilityTestsVB
CreditCardUtilityTests
bin
Debug
CreditCardUtility.dll
CreditCardUtilityTests.dll
nunit.framework.dll
CreditCardUtilityTests.vbproj.user
My Project
Application.myapp
Settings.settings
CreditCardUtilityVB
CreditCardUtility
bin
Debug
CreditCardUtility.dll
CreditCardUtility.pdb
My Project
Application.myapp
Settings.settings
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 Bluelaser.Utilities;
using System.Text;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            //Display test credit card numbers
            this.lblMc.Text = CreditCardUtility.GetCardTestNumber(CreditCardTypeType.MasterCard).Replace(" ", "-");
            this.lblVisa.Text = CreditCardUtility.GetCardTestNumber(CreditCardTypeType.Visa).Replace(" ", "-");
            this.lblDisc.Text = CreditCardUtility.GetCardTestNumber(CreditCardTypeType.Discover).Replace(" ", "-");
            this.lblAmex.Text = CreditCardUtility.GetCardTestNumber(CreditCardTypeType.Amex).Replace(" ", "-");
        }
    }

    protected void btnValidate_Click(object sender, EventArgs e)
    {
        if (txtCard.Text.Length > 0)
        {
            string cardNum = txtCard.Text.Trim();

            if (CreditCardUtility.IsValidNumber(cardNum))
            {
                CreditCardTypeType? cardType = CreditCardUtility.GetCardTypeFromNumber(cardNum);
                string strCardType = (cardType == null) ? "Unknown" : cardType.ToString();

                showMessage(String.Format("You have entered a valid card number. The card type is {0}.", strCardType), true);
            }
            else
                showMessage("Card failed Luhn test. Please enter a valid card number.", false);
        }
        else
            showMessage("Please enter a card number first.", false);
    }

    protected void showMessage(string msg, bool isSuccess)
    {
        this.lblMsg.Text = msg;

        if (isSuccess)
            lblMsg.CssClass = "success";
        else
            lblMsg.CssClass = "fail";
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

BlueLaser05
Web Developer
United States United States
Todd Anglin is an Experts Exchange ASP.NET Master and a Telerik Technical Evangelist responsible for building a strong Telerik community across the globe. Before joining Telerik, Todd worked as a developer in a Fortune 200 financial services company in San Antonio as a Systems Analyst supporting applications on a wide range of platforms and technologies, including Unix, Windows Server, Informix, Oracle, and SQL Server. Todd graduated Magna Cum Laude with Business Honors from Mays Business School at Texas A&M University with a BBA in MIS and now resides with his wife in The Woodlands, Texas.

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