security in web

Please clarify what type of security you need?

hi mudassar

I want Avoid being hack from other people 

 I mean any body cant done my website

i have login page-search page-upload file

I want EX: in my login page just my user can enter to their page and I use captcha but I think its not enough and i have file up load item i thing this Item can be dangerous for my site and ofcourse i use data base I think  it is the other thing that can be disadvantage of my site i heared something about sqlinjection .

And anything that can guarantee the security of my site from hackers

1. Use FilterTextBoxExtender and restrict textboxes to only alphanumeric plus some special characters

2. Do File extension validation and size validation

hi 

thanks for your answer

1. Use FilterTextBoxExtender and restrict textboxes to only alphanumeric plus some special characters

i dont Know any thing about it do have any article about it ?

and you didnt say any thing about sqlinjection?

do you have any article or refrence about security in website?

thanks

If you restrict characters there will be no sql injection

http://www.aspsnippets.com/Articles/Using-Parameterized-queries-to-prevent-SQL-Injection-Attacks-in-SQL-Server.aspx

http://www.datasprings.com/resources/articles-information/configuring-ajax-filteredtextbox-control