Give Proper permission through Run SPSecurity.RunWithElevatedPrivileges

 SPSecurity.RunWithElevatedPrivileges(delegate()
            {
                SPSite site = SPContext.Current.Site;

                SPWeb web = SPContext.Current.Web;

                using (SPSite newSite = new SPSite(site.ID))
                {
                    using (SPWeb newWeb = newSite.OpenWeb(web.ID))
                    {
                        foreach (SPGroup group in newWeb.Groups)
                        {
                            foreach (SPUser u in group.Users)
                            {
                                if (SPContext.Current.Web.CurrentUser.Name == u.Name)
                                {
         SPQuery depquery = new SPQuery();
         depquery.Query = "<Where><Contains><FieldRef Name='Title' /><Value Type='Text'>" + group.Name + "</Value></Contains></Where>";
         SPListItemCollection item = SPContext.Current.Web.Lists[Constants.HNBDepartmentList()].GetItems(depquery);

                                    if (item.Count > 0)
                                    {
                                        grpName = group.Name;
                                    }
                                }
                            }
                        }
                    }
                }



            });

User Profile Syncronisation Service "Starting" Fixed

http://myspexp.com/2011/04/28/user-profile-synchronization-servicehangs-on-starting-i-fixed-it/

Adding and Install .wsp to a Site Collection using Powershell Commands

Stsadm

To Add : stsadm –o addsolution –name SharePointProject2.wsp

To Install : stsadm –o deploysolution –name SharePointProject2.wsp –url http://moss-server –allowCasPolicies –immediate

To Upgrade : stsadm –o upgradesolution –name SharePointProject2.wsp –filename SharePointProject2.wsp –immediate –allowCasPolicies

PowerShell

To Add : Add-SPSolution c:\code\SharePointProject2\bin\debug\SharePointProject2.wsp

To Install : Install-SPSolution –Identity SharePointProject2.wsp –WebApplication http://sp2010 -GACDeployment

To Update : Update-SPSolution –Identity SharePointProject2.wsp –LiteralPath c:\code\SharePointProject2\bin\debug\SharePointProject2.wsp –GACDeployment

To Uninstall : Uninstall-SPSolution –Identity SharePointProject2.wsp –WebApplication http://sp2010

To Remove : Remove-SPSolution –Identity SharePointProject2.wsp