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HttpRequest.ApplicationPath Property

Gets the ASP.NET application's virtual application root path on the server.

Namespace:  System.Web
Assembly:  System.Web (in System.Web.dll)

public string ApplicationPath { get; }

Property Value

Type: System.String
The virtual path of the current application.

Use this property to construct a URL relative to the application root from a page or Web user control that is not in the root directory. This allows pages and shared controls that exist at different levels of a directory structure to use the same code to link to resources at fixed locations in the application.

The following example uses the Write method to HTML-encode and then write the value of the ApplicationPath property to a text file. This code example is part of a larger example provided for the HttpRequest class. It assumes the existence of a StreamWriter object named sw.

// Write request information to the file with HTML encoding.
sw.WriteLine(Server.HtmlEncode(DateTime.Now.ToString()));
sw.WriteLine(Server.HtmlEncode(Request.CurrentExecutionFilePath));
sw.WriteLine(Server.HtmlEncode(Request.ApplicationPath));
sw.WriteLine(Server.HtmlEncode(Request.FilePath));
sw.WriteLine(Server.HtmlEncode(Request.Path));

The following example uses the ApplicationPath property to programmatically construct a path to a resource that is in a fixed location in the application. The page that references the resource does not have to be located in the same directory as the resource.

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    protected void Page_Load(object sender, EventArgs e)
    {
        Label1.Text = Request.ApplicationPath;
        Image1.ImageUrl = Request.ApplicationPath + "/images/Image1.gif";
        Label2.Text = Image1.ImageUrl;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>HttpRequest.ApplicationPath Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        ApplicationPath:<br />
        <asp:Label ID="Label1" runat="server" ForeColor="Brown" /><br />

        <asp:Image ID="Image1" runat="server" /><br />

        ImageUrl:<br />
        <asp:Label ID="Label2" runat="server" ForeColor="Brown" />
        <br />
        </div>
    </form>
</body>
</html>

If you run this example in a Web application that is named WebSite1, /WebSite1 will be displayed as the value of the ApplicationPath property and /WebSite1/images/Image1.gif will be displayed as the complete path of the image.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
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