Check if a user already exists in Active Directory group

Check if a user already exists in Active Directory group:

Note: To add or read properties from an Active Directory group you need to have special username and password like an Active Directory admin.

DirectoryEntry addGroup;

string folderPath = "LDAP://CN=" + folderName + ",";

folderPath += "OU=SharedFolder,OU=Groups,DC=aaaaa,DC=com";

string usrId = “myUserID”;

addGroup = new DirectoryEntry(folderPath, "Spluser", "password");

protected bool chkUserExistence(DirectoryEntry addGroup, string usrId)

    {

        bool usrExists = false;

        object allMembers = addGroup.Invoke("members", null);

        foreach (object member in (IEnumerable)allMembers)

        {

            DirectoryEntry memberEntry = new DirectoryEntry(member);

            if (usrId == memberEntry.Name.ToString())

            {

                usrExists = true;

                break;

            }

        }

        return usrExists;

    }

Leave your comments below.