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Follow below links how to bind data to grid through AJAX:
http://www.codescratcher.com/jquery/bind-data-to-gridview-with-jquery-json-asp-net/
http://www.aspsnippets.com/Articles/Bind-Dataset-to-ASPNet-GridView-using-jQuery-AJAX.aspx
http://www.aspdotnet-suresh.com/2013/01/aspnet-download-and-upload-files-to.html
http://www.webcodeexpert.com/2013/04/how-to-upload-download-and-delete-files.html
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http://codepedia.info/2015/06/upload-image-using-jquery-ajax-asp-net-c-sharp/
http://www.aspdotnet-suresh.com/2015/02/jquery-upload-images-files-without-page-refresh-postaback-in-aspnet.html
http://www.aspsnippets.com/Articles/Uploading-files-using-jQuery-AJAX-and-Generic-Handler-ASHX-in-ASPNet.aspx
hi just refer this link.May be its useful for U!