Dear ,,
i was trying Grid attachment column demo example in development environment (Windows server 2008+VS 2008)i get the follwing error: No file uploaded. Action canceled.
Looking at the code for the demo it seems as you are either not uploading an image, or there is no name associated with the file you are uploading. I know that if you have a certain max upload size then this would essentially act as if there is no item at all in the upload (since you are going past the maximum size allowed for uploading) and this error would then be received. Are you sure that the files that you are uploading are within the maximum file size of the AttachmentColumn? The property you are looking for in this case is "MaxFileSize".