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WriteFile Method (String)

HttpResponse.WriteFile Method (String)

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.

ExceptionCondition
ArgumentNullException

The filename parameter is null.

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 HTML text and input controls) directly to the output stream.

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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
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