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Programming ASP.NET 3.5, 4th Edition by Jesse Liberty, Dan Hurwitz, Dan Maharry

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The FileUpload Control

Often an application needs to allow users to upload files to the web server. The FileUpload control makes it easy for the user to browse for and select the file to transfer, providing a Browse button and a text box for entering the filename. Once the user has entered a fully qualified filename in the text box, either by typing it directly or by using the Browse button, the SaveAs method of the FileUpload control can be called to save the file to disk.

In addition to the normal complement of members inherited from the WebControl class, the FileUpload control also exposes several read-only properties of particular interest, listed in Tables Table 5-15 and Table 5-16.

WizardDemo.aspx after some navigation

Figure 5-18. WizardDemo.aspx after some navigation

Table 5-15. FileUpload properties (read-only)

Name

Type

Description

FileContent

Stream

Returns a Stream object that points to the file to upload.

FileName

String

Returns the name of the file to be uploaded, without any qualifying path information.

HasFile

Boolean

If true, indicates the control has a file to upload.

PostedFile

HttpPostedFile

Returns a reference to the file which has been uploaded. Exposes the read-only properties listed in Table 5-16.

Table 5-16. HttpPostedFile properties (read-only)

Name

Type

Description

ContentLength

Integer

Returns the size of the file, in bytes, of an uploaded file.

ContentType

String

Returns the MIME content type of the uploaded file (e.g., ...

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