I have an ASP.NET file upload control which sits as part of a form. The file upload control is on the content page while the form definition is on a master page across the site. I've added multipart/form-enc to the form on the master page.
I'm using jQuery to submit the form as I show a dialog box from jQuery UI.
When I post, no file is returned to the server. The file upload control has no file and HttpFileCollection is empty. How can I find the posted file?
Try using the JQuery Forms Plugin? http://plugins.jquery.com/project/form/
See this example: http://malsup.com/jquery/form/#file-upload
Here is another example: http://malsup.com/jquery/form/file/
I think it could be a problem with persistence. Check this out:
http://forums.asp.net/p/1173651/1971535.aspx#1971535
HTH
Most dialogs take your content, wrap it, and place the result just before </body> in the page...this is a problem in ASP.Net because that's outside the <form></form>, it needs to be inside to be included in the POSTed data.
When you create the dialog, make it append inside the <form> when it finishes instead of the <body>, for example this is what you'd do with the jQuery UI dialog:
$("#myDiv").dialog({ ...options... }).parent().appendTo("form:first");
Now that it's been moved inside the <form>, it should post correctly.