HttpResponse.WriteFile Method (String, Int64, Int64)
Writes the specified file directly to an HTTP response output stream.
Assembly: System.Web (in System.Web.dll)
When this method is used with large files, calling the method might throw an exception. The size of the file that can be used with this method depends on the hardware configuration of the Web server. For more information, see article 812406, "PRB: Response.WriteFile Cannot Download a Large File" on the Microsoft Knowledge Base Web site.
The following example writes all the contents of a text file named Login.txt (which might contain literal text and HTML input controls) directly to the output stream.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.