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Something to be acutely aware of is that security in SharePoint is independent of the actual site/sub site architecture; any site in SharePoint can have a completely unique set of users and permissions irrespective of its parent or children In development, security can be a very big issue Whenever operating inside of SharePoint (as a web part or Event Receiver does), the code runs under the permissions and security of the current user If you attempt to connect to a SharePoint site or list that the user doesn t have access to, you will get an access denied error, or worse, the end users get prompted to log in since you don t have much control over how SharePoint will deal with a permissions error In many types of web parts, you ll find that you can easily operate as the current user without any issues (only testing will prove this for sure!), but you will also find that there are some situations where you simply cannot get around it A good example is when you want to know all of the sub sites of the current site, which is something a member user does not usually have access to do Since advanced access is often necessary, you can skirt SharePoint s security by using NET Impersonation Impersonation allows you to temporarily log in as another user, perform some action, and then log out and resume the identity of the original user Note that this is not the same as site impersonation in NET; in-code impersonation uses the Windows Identity object While impersonation is simple enough, you do have an issue with what account to use Impersonation requires the full account information (Domain, User Name, and Password) and you certainly don t want to hardcode such information (if changed, a recompile would be necessary) and/or expose it to the public either To get around this, NET provides a way to retrieve the information from the System Registry or the website webconfig file (shown next).

from the shortcut menu Right-clicking the form tab only closes the form Two additional features that help turn a form into a dialog box are the default and Cancel button properties: The command button specified as the default button is pushed automatically when the user presses enter The command button specified as the Cancel button is pushed automatically when the user presses esc You can assign any one button in the form as the default button and another as the Cancel button by setting the Default or Cancel control property to Yes While you are working with the command button properties, you can add ScreenTips that will appear when you rest the mouse pointer over the button To add ScreenTips, type the text in the button s ControlTip Text property box on the Other tab of the Property Sheet In this case, enter Open the selected report in Print Preview as the ControlTip

Using impersonation is really quite simple Prior to doing something that requires a higher level of security, you simply establish a new identity, do the work necessary, and then release the identity A perfect example of this is accessing webs using the SPWeb object; the method AllWebs returns a collection of all sub sites in the site For example:

20:

using SystemSecurityPrincipal; // Needed for Impersonation using MicrosoftWin32; // Needed for access to the Registry using SystemDiagnostics; // Needed for Event Log //-----------------------------------------------------------------------// START IMPERSONATION BEFORE WE ATTEMPT TO GET THE WEBS:

Now switch to Form view to see the new Choose Report dialog box, ready for previewing and printing Police reports

WindowsImpersonationContext GlobalWIC = StartImpersonation("Domain","Account","Password"); try { SPWebCollection TheWebCol = MySPWebAllWebs(); } catch (Exception ErrInAccess) { string ErrIs = ErrInAccessMessageToString(); if (ErrIsIndexOf("401") > -1) { ErrIs = "ERROR: Account Access Denied"; } } // Done - stop impersonation: EndImpersonation(GlobalWIC);