I am developing an inventory software using c#,asp.net,sql server 2005. I have a login.aspx page which has the login box with the username and password. When I click the login box, I want asp.net to check the SQL database to check if the username and password are valid, and then continue to the next page. How will I do that?
Pls. help

Since you are developing this in C# I am not entirely sure why you are posting in a VB.NET forum.

Google is your friend
http://www.google.com/search?source=...T+-+Membership

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You need to collect the username and password from the form, pass them to a SQL query then analyze the result.

It sounds like you might need to pick up a beginning ASP.NET book such as Beginning ASP.NET 3.5: In C# and VB. It is targeted at ASP.NET 3.5 but much of it is applicable to 2.0.

-Peter
peterlanoie.blog