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HttpPostedFile Class

Provides access to individual files that have been uploaded by a client.

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

public sealed class HttpPostedFile
public final class HttpPostedFile
public final class HttpPostedFile

The HttpFileCollection class provides access to all the files that are uploaded from a client as a file collection. The HttpPostedFile class provides properties and methods to get information about an individual file and to read and save the file.

The HtmlInputFile control can be used to select and upload files from a client.

Files are uploaded in MIME multipart/form-data format. By default, all requests, including form fields and uploaded files, larger than 256 KB are buffered to disk, rather than held in server memory.

You can specify the maximum allowable request size by accessing the MaxRequestLength property or by setting the maxRequestLength attribute of the httpRuntime Element (ASP.NET Settings Schema) element within the Machine.config or Web.config file. The default is 4 MB.

The amount of data that is buffered in server memory for a request, which includes file uploads, can be specified by accessing the RequestLengthDiskThreshold property or by setting the requestLengthDiskThreshold attribute of the httpRuntime Element (ASP.NET Settings Schema) element within the Machine.config or Web.config file.

By adjusting the MaxRequestLength and RequestLengthDiskThreshold properties, you can fine tune the performance of your server. Additionally, you should consider setting the MaxRequestLength to prevent denial of service attacks caused by users posting large files to the server.

Server resources that are allocated to buffer the uploaded file will be destroyed when the request ends. To save a durable copy of the file, use the SaveAs method.

TopicLocation
How to: Upload Files with the FileUpload Web Server ControlBuilding ASP .NET Web Applications
How to: Upload Files with the FileUpload Web Server ControlBuilding ASP .NET Web Applications
System.Object
  System.Web.HttpPostedFile
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0
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