public static void LeaveGroup(this SPUser spUser, string groupName, SPWeb spWeb)
{
SPSecurity.RunWithElevatedPrivileges(delegate()
{
using (SPSite site = new SPSite(spWeb.Site.ID))
{
using (SPWeb web = site.OpenWeb(spWeb.ID))
{
SPGroup spGroup = web.SiteGroups[groupName];
if (spUser.InGroup(spGroup))
{
web.AllowUnsafeUpdates = true;
spGroup.RemoveUser(spUser);
web.AllowUnsafeUpdates = false;
}
}
}
});
}