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.
Figure 5-18. WizardDemo.aspx after some navigation
Table 5-15. FileUpload properties (read-only)
Returns the name of the file to be uploaded, without any qualifying path information.
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)
Returns the size of the file, in bytes, of an uploaded file.
Returns the MIME content type of the uploaded file (e.g., ...