Hi I need to upload an image in list anonymously using the sandbox solution is there any way to do.
I have 3 fields (Name[string] , Phone[int] , Picture[Attachment])
i can insert Name and Phone anonymously but how do i upload the attatchment.

Please hel

Here are the ways.. 

Using script

http://amalhashim.wordpress.com/2013/05/13/sharepoint-sandbox-solution-adding-attachment-to-listitem/

Using client object model

http://blogs.msdn.com/b/sridhara/archive/2010/03/12/uploading-files-using-client-object-model-in-sharepoint-2010.aspx

COM not working