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HttpResponseWrapper.TransmitFile Method (String, Int64, Int64)

Writes the specified part of a file to the HTTP response output stream, without buffering it in memory.

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

public override void TransmitFile(
	string filename,
	long offset,
	long length


Type: System.String

The name of the file to write to the HTTP output stream.

Type: System.Int64

The position in the file where writing starts.

Type: System.Int64

The number of bytes to write, starting at offset.


The offset parameter is less than zero.

- or -

The length parameter is less than -1.

- or -

The length parameter is greater than the file size minus offset.


The out-of-process worker request is not supported.

- or -

The response is not using an HttpWriter object.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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