File Upload control validation

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Hi,

I have a problem in uploading the file name for an image. When ever I try to Upload an image with the name having special characters, during the preview it creates problem. So I want to restrict the file upload control to restrict the entry of the special characters.

Here is an example of the image name that is creating the problem.
Månadens-erbjudande-CBC-sept--12

Here the 2nd character is creating problem for me. So I want to apply validation for the entry of the special characters in the file upload control. Any help will be appreciated. Thanks in advance.

Posted 6-Jan-13 22:15pm

sisir patro

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**Orcun Iyigun** · Answer 1 · 2013-01-06T23:05:00

To upload images to the server from Asp.Net web application, we will use the FileUpload server control. This control can be validated to upload only Image files using the RegularExpressionValidator control.

To achieve this drag and drop a FileUpload and RegularExpressionValidator control into your aspx page. Then set the ControlToValidate property as “FileUpload1” and the ValidationExpression property as specified below.

C#

<asp:FileUpload ID="FileUpload1" runat="server" />

<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="FileUpload1"
 ErrorMessage="Invalid Image File"
ValidationExpression=
"^([0-9a-zA-Z_\-~ :\\])+(.jpg|.JPG|.jpeg|.JPEG|.bmp|.BMP|.gif|.GIF|.png|.PNG)$">
 </asp:RegularExpressionValidator>

So the above RegularExpressionValidator will only allow jpg, jpeg, bmp, gif, png formats image files. You can add more file formats separated by “|” symbol. Also you can specify more special characters after the string “_\-~” to allow the files you want to upload to the server.

Good luck,
OI