F ound the solution myself. Had to add the csv extension in the ashx file as well along with the controller.   It is working now.  

Hi,   Which AJAX framework are you using ? Microsoft AJAX or other ?   Uploader do not fire client side event after the server side FileUploaded get executed.   Because the way to do the postback is various.   At server side you can register javascript output for the AJAX .   Regards, Terry

Hi aviweiss,   You can find the mvc4 example code in the demo download package.    mvc4_cs_razor, mvc4_cs   Regards,   Ken 

Dear BostonMerlin,   Please refer to http://cutesoft.net/forums/post/56964.aspx    Regards, Eric

Suvradeep,   Please check the following article:   How do I handle a large file upload?

Hi mchamo, Can you create a simple example which can reproduce this issue and send it to Kenneth@CuteSoft.net (with all require fils) ? I will check it and get back to you as soon as possible. Regards, Ken

Hello,   I am looking to purchase the Ajax Uploader and I have few questions. I know it does a maximum file size test.   I want to know if it can do a mimimum file size validation. ie I only want images that are larger than 200mb ... is this possible?   Thanks   David 

Hi Ken,   when I set UploadType=''IFrame'' then it works, but I can only upload one file with you control. I want to use your product for uploading multiple files. Also when I set uploader.SetAdvancedOption(UploaderAdvancedOption.NoFlash10,''true'') then I can only upload one file and not multiple. Yes, I use Flash10. Many people use ...

Hi,   Did you check that sample page ? http://ajaxuploader.com/Demo/Start-uploading-manually.aspx   or the download package Ajax-Uploader.zip , Framework 2.0-Csharp-NoAjax\Start-uploading-manually.aspx   You can get the script for your step 2 ,   Regards, Terry

Hi hemantp, Parameter {0} is the upload file name uploader1.FileTooLargeMsg = ''file {0} is too large '';  Regards, Ken