With the asp:FileUpload control you would do something like
Dim myVar As String = FileUpload1.PostedFile.ContentType

b-man,

 

For security reason. Uploader do not provide that property .

 

You can determine the mimetype from the file extension.

 

Please check our sample code , Ajax-Uploader\AdvancedCS20-MicrosoftAjax\App_Code\SampleUtill.cs

 

the static public string GetMimeType(string filename) show you how to get the mimetype of a file.

 

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Maybe we can collect all the relation and provide that property by filename, but we would not allow the value from client.

 

Regards,

Terry