a .net data provider is a collection of objects used to communicate between a data source and a data set in other words a data provider is used to communicate with a data source i e database execute commands against the data source and then retrieve results from the data source
By default, the work item file attachment size limit is 2,048 kilobytes (2 MB). For information on how to change the attachment size limit, see How to: Set the Maximum Attachment Size for Work Items. Consider the implications carefully before changing the default attachment size limit. Changing the attachment limit value will alter the attachment size limit for all Team Foundation Server users.
The value needs to be specified in KB, for example if you want to increase to 50MB, then type 51200. If you type in 0, then there is no limit to the maximum attachment size. Click OK and close the registry editor. Now you will be able to attach large files. Please note, even though you can attach any size using this hack, the actual attachment size depends on your email service provider limit.