Windows apps
Collapse the table of content
Expand the table of content
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

Stream.Seek Method

When overridden in a derived class, sets the position within the current stream.

Namespace:  System.IO
Assembly:  mscorlib (in mscorlib.dll)

public abstract long Seek(
	long offset,
	SeekOrigin origin


Type: System.Int64
A byte offset relative to the origin parameter.
Type: System.IO.SeekOrigin
A value of type SeekOrigin indicating the reference point used to obtain the new position.

Return Value

Type: System.Int64
The new position within the current stream.


An I/O error occurs.


The stream does not support seeking, such as if the stream is constructed from a pipe or console output.


Methods were called after the stream was closed.

Use the CanSeek property to determine whether the current instance supports seeking.

If offset is negative, the new position is required to precede the position specified by origin by the number of bytes specified by offset. If offset is zero (0), the new position is required to be the position specified by origin. If offset is positive, the new position is required to follow the position specified by origin by the number of bytes specified by offset.

Classes derived from Stream that support seeking must override this method to provide the functionality described above.

Seeking to any location beyond the length of the stream is supported.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

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.

Community Additions

© 2017 Microsoft