.NET Framework Class Library
HttpResponse..::.TransmitFile Method (String)

Writes the specified file directly to an HTTP response output stream, without buffering it in memory.

Namespace:  System.Web
Assembly:  System.Web (in System.Web.dll)
Syntax
Visual Basic (Declaration) 
Public Sub TransmitFile ( _
    filename As String _
)
Visual Basic (Usage) 
Dim instance As HttpResponse
Dim filename As String

instance.TransmitFile(filename)
C# 
public void TransmitFile(
    string filename
)
Visual C++ 
public:
void TransmitFile(
    String^ filename
)
JScript 
public function TransmitFile(
    filename : String
)

Parameters

filename
Type: System..::.String
The name of the file to write to the HTTP output.
Exceptions
ExceptionCondition
ArgumentNullException

The filename parameter is nullNothingnullptra null reference (Nothing in Visual Basic)
Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0
See Also

Reference

HttpResponse Class
HttpResponse Members
TransmitFile Overload
System.Web Namespace
Tags :


Community Content

A_HREF
This method does not work with UNC-share file paths.

This method does not work with UNC-share file paths, so you have to check it before using this method, for example:

if (filePath.StartsWith(@"\\"))
	context.Response.WriteFile(filePath, false);
else
	context.Response.TransmitFile(filePath);

Joao.Tab
It DOES work with UNC-share file paths
After tracing the Win API calls with Process Monitor and finding an 'Access Denied' error inside the API, we managed to make it work by adding the Web Server computer with Read access to the Network Share in both the Share Permissions and Security Permissions tabs. We were impersonating a Network User with Read Access but it didn't work, we had to add the computer as well.

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