Add Active Directory Users to SharePoint Group

string loginName = null;


string loginEmail = null;

SPSite thisSite = null;

SPWeb thisWeb = null;

SPGroup thisGroup = null;

DirectoryEntry user = null;



DirectoryEntry directoryEntry = new DirectoryEntry(ldap://yourdomain/);

DirectorySearcher ds = new DirectorySearcher(directoryEntry);

ds.Filter = "(&(objectClass=group)(cn=yourgroup))";



object groupMembers = ds.FindOne().GetDirectoryEntry().Invoke("Members", null);

foreach (object groupMember in (IEnumerable)groupMembers)

{

user = new DirectoryEntry(groupMember);

if (!(user.Properties["sAMAccountName"].Value == null))

{

loginName = user.Properties["sAMAccountName"].Value.ToString();

}



if (!(user.Properties["mail"].Value == null))

{

loginEmail = user.Properties["mail"].Value.ToString();

}



string userName = user.Name.Remove(0, 3).Replace("\\", "");





thisSite = new SPSite("http://yoursite");

thisWeb = thisSite.OpenWeb();

thisGroup = thisWeb.SiteGroups["yourgroup"];

try

{



if (thisGroup.Users["yourdomain\\" + loginName].LoginName.ToString() == loginName) { }

}

catch

{

thisGroup.AddUser("yourdomain" + loginName, loginEmail, userName, "Added by System.");

}

}

thisWeb.Dispose();

thisSite.Dispose();

user.Dispose();

ds.Dispose();