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HttpResponse.WriteFile Method (String)

.NET Framework 4.5

Writes the contents of the specified file directly to an HTTP response output stream as a file block.

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

public void WriteFile(
	string filename
)

Parameters

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

Exceptions

Exception	Condition
ArgumentNullException	The filename parameter is null.

Remarks

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.

Examples

The following example writes all the contents of a text file named Login.txt (which might contain literal HTML text and input controls) directly to the output stream.

Response.Write("Please Login: <br>");
 Response.WriteFile("login.txt");

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Platforms

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.

Reference

HttpResponse Class

WriteFile Overload

System.Web Namespace

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