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How can you program a FileUpload control in ASP.Net 3.5 to browse for Excel files only

mainrotor
mainrotor asked
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Last Modified: 2012-06-27
Hi Experts,
I have an ASP.Net 3.5 application with VB.Net codebehind.  I use a FileUpload control in my application to allow the user to browse for a given Excel file.  How can i program the FileUpload control so that it only searches for Excel files (files with the .xls extension only)

Thank you in advance,
mrotor
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Carlos VillegasFull Stack .NET Developer

Commented:
Hi, Is not exactly what your are asking for but I think that fit into your scenario:
http://sathishmncl.blogspot.com/2010/11/file-upload-control-validation-using.html
Carlos VillegasFull Stack .NET Developer

Commented:
By the way, there is not way (in my knowledge) to apply a filter to the web browser file dialogue, but the technique in that link is good to workaround that.
Try using the code given below. This is not exactly what you want but you help you restrict the files to be selected are only excel

if (filename.indexOf(".xls") == -1) {
  alert(filename + " in not an excel file");
} else {
  // process the file...
}  
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