Many times there can be a situation where we require the IP address of a user.For ex while placing an order on Shopping portal we need the IP address for security purposes.Below is the code of how to find users IP address in ASP.NET.

public string FindIPAddress()
{
    try
    {
        HttpRequest currentRequest = HttpContext.Current.Request;
        string ipAddress = currentRequest.ServerVariables["HTTP_X_FORWARDED_FOR"];

        if (ipAddress == null || ipAddress.ToLower() == "unknown")
            ipAddress = currentRequest.ServerVariables["REMOTE_ADDR"];

        return ipAddress;
    }
    catch (Exception ex)
    {
        
    }
}