Breaking page inheritance programatically in sharepoint 2010

Question

I have certain page in SharePoint where i need to break inheritance remove certain security groups form the permissions permanently.Al i want to do is through programatically to be done.Please suggest any ideas on this. Thanks.

Answer 1

You can follow this post:
Assigning SharePoint List Item level permission programmatically

Excerpt from article:

RemoveAllPermissions Function

private static void RemoveAllPermissions(SPListItem CurrentlistItem)
    {
        //The below function Breaks the role assignment inheritance for the list and gives the current list its own copy of the role assignments
        CurrentlistItem.BreakRoleInheritance(true);
        //Get the list of Role Assignments to list item and remove one by one.
        SPRoleAssignmentCollection SPRoleAssColn = CurrentlistItem.RoleAssignments;
        for (int i = SPRoleAssColn.Count - 1; i >= 0; i--)
        {
            SPRoleAssColn.Remove(i);
        }
    }

GrantPermission Function

private static void GrantPermission(SPListItem CurrentListItem, SPWeb oSPWeb, SPRoleType SPRoleType, SPPrincipal SPPrincipal)
    {
        try
        {
            //Create one Role Definition i.e Full Controls, Contribute rights or Read rights etc.
            SPRoleDefinition oSPRoleDefinition = oSPWeb.RoleDefinitions.GetByType(SPRoleType);
            //Create one Role Assignment for the specified SP user or group.
            SPRoleAssignment oSPRoleAssignment = new SPRoleAssignment(SPPrincipal);
            //Bind the role definition to the role assignment object created for the user or group.
            oSPRoleAssignment.RoleDefinitionBindings.Add(oSPRoleDefinition);
            //Add it to the specified list item.
            CurrentListItem.RoleAssignments.Add(oSPRoleAssignment);
            //update the list item so that specified user assignment will have the access.
            CurrentListItem.Update();
        }
        catch (Exception ex)
        {
            EventLog.WriteEntry("Error in UAR Initiation Workflow", "GrantPermission() : " + ex.Message);
        }
    }

You can get the List Item for SPFile using SPFile.Item