Developing a Full Trust Proxy
Not all SharePoint solutions can fit within the boundary of a sandbox. You may have scenarios where you need to write a file to the disk, access databases, or web service. As discussed earlier you are restricted to performing these operations in custom code to be deployed as a sandboxed solution. In such cases, you can overcome these restrictions by developing a full trust proxy. Using a full trust proxy, your sandboxed code can make a call to a trusted assembly that is deployed as a farm solution. This assembly performs the restricted operation on behalf of your sandboxed code and returns the operation execution result.
You may be wondering what the benefit is of such a complicated approach to break the sandbox ...
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