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Quick Reference - ASP.NET

General¶

Item	Code
Current HTTP Request object	HttpContext.Current.Request
Session ID	string sessionId = HttpContext.Current.Session.SessionID;
Maintaining scroll position on postback	In the <%@ Page %> directive, set the MaintainScrollPositionOnPostback property to true
Disabling caching of a page.	In the Page_Load event handler: Response.Cache.SetCacheability(HttpCacheability.NoCache)

Client Information¶

Item	Code
IP address	Request.UserHostAddress
Computer Name	using System.Net; string remoteHost = Request.ServerVariables["REMOTE_HOST"]; IPHostEntry client = Dns.GetHostEntry(remoteHost); string clientName = client.HostName; uxClientNameLabel.Text = clientName;
User Name	string loginName = System.Threading.Thread.CurrentPrincipal.Identity.Name using System.Net; string loginName = Request.ServerVariables["REMOTE_USER"]; or string loginName = Request.ServerVariables["AUTH_USER"]; or string loginName = System.Web.HttpContext.Current.User.Identity

URL of Application Root¶

The following method will return, for example, http://localhost:2297/Version 1.0/. This is the root directory of the web application: the current page's URL, stripped of the path, filename, and any query string. For more information on using this function with CSS, JS, and XSL files, go here.

Public Shared ReadOnly Property ApplicationRootUrl() As String
    Get
        Dim r As HttpRequest = HttpContext.Current.Request
        Dim result As String = r.Url.Scheme   ' e.g., "http"
        result &= System.Uri.SchemeDelimiter  ' e.g., "://"
        result &= r.Url.Authority             ' e.g., "localhost:86065"
        result &= r.ApplicationPath           ' e.g., "/MyPath/"

        If Not result.EndsWith("/") Then
            result &= "/"
        End If

        Return result
    End Get
End Property

public static string AppRootUrl
{
    get
    {
        var r = HttpContext.Current.Request;
        var result = r.Url.Scheme;      // e.g., "http"
        result += Uri.SchemeDelimiter;  // e.g., "://"
        result += r.Url.Authority;      // e.g., "localhost:86065"
        result += r.ApplicationPath;    // e.g., "/MyPath/"

        if (!result.EndsWith("/"))
            result += "/";

        return result;
    }
}