How to use a web service in ASP.NET C# to check user details?

I've create a website in visual studio's 2005 in ASP.NET C#, one part of my website requires to check the user details for example personal details and bank details.


The web service must contain the following





-If the details entered by the user don’t match the original


Entered previously by the user and is stored with their profile. Then a message appears asking the user to adjust their details.





-If the details are correct then I want a message stating that the transaction was successful





- Check the type of card that they are using





- if there’s not enough funds in the correct return a message stating that there’s not enough funds in the account.





It’s basically the same process as when you’re using Amazon to purchase goods. For example checks the details that you already have stored in your profile (personal details %26amp; bank) if they match it checks that the funds are available in your account. Can someone write the code in C# ASP.NET using Visual Studios to using the web service to accomplish this(has to be in the web service)





Thanks

How to use a web service in ASP.NET C# to check user details?
You can use the security features in ASP.NET to create user accounts:





http://quickstarts.asp.net/QuickStartv20...





From that, you can associate user accounts you store in a SQL database with the user, and give the logged-in user a way to update those details.





You'll need a payment gateway of some sort to check account balances. In other words, you need a merchant account to check credit balances.





It actually sounds like you should start with the storefront starter kit that ASP.NET provides, and customize that to fit your needs:





http://www.asp.net/downloads/starterkits...