How to get a client's ip address with ASP.NET

I want to fetch client's ip address as soon as he accesses my web-site built in asp.net.Then i want to store it in my database.
Is there any method to achieve this target in asp.net application.
If you could help me i will be very thankful to you.

ASP .Net web page:
ASP .NET web services:

or you can try:

string ip;

ip=Request.ServerVariables("HTTP_X_FORWARDED_FOR") ;
if(ip==string.Empty)
{
ip=Request.ServerVariables("REMOTE_ADDR");
}
REMOTE_ADDR does not always provide the users IP but rather the ISPs' IP address so first test HTTP_X_FORWARDED_FOR as this one is the real user IP.

This is very helpful for me. Many thanks

Another important note to this

the HTTP_X_FORWARDED_FOR may contain an array of IP, this can happen if you connect through a proxy.
What also happens when this happens is that the REMOTE_ADDR may contain the proxy IP.

to avoid this problem you can parse the HTTP_X_FORWARDED_FOR for the last entery IP.

this can easily be done using...
This code example is C#.NET but the method is the same

What this does is check if we have anything in the HTTP_X_FORWARDED_FOR, and if we do we take out the last entry (works if only one entry is found aswell)
if we don't have an HTTP_X_FORWARDED_FOR we set the IP from the REMOTE_ADDR instead