Add user to group in active directory using C#.Net

In this article we will discuss about how we can add an user to Active directory using C#.Net code. Also you can check out my previous posts on:

- Caching in Asp.Net

- Get control value using JavaScript with master page in Asp.Net

- Add ajaxcontroltoolkit to Visual Studio 2012

Below is the full code:

First we need to write using statements like below:

using System.DirectoryServices;
using System.DirectoryServices.AccountManagement;
public partial class AddUserToAD : System.Web.UI.Page
{
    string domain = "UR Domain";
    string serviceUser = "ServiceUserAccount";
    string servicePassword = "ServicePassword";
    string defaultOU = "defaultOU";

    protected void Page_Load(object sender, EventArgs e)
    {
         AddUserToAD ("Test User","Test Group")
    }

    string AddUserToAD(string userName, string groupName)
    {
        try
        {
            UserPrincipal oUserPrincipal = GetUser(userName);
            GroupPrincipal oGroupPrincipal = GetGroup(groupName);
            if (oUserPrincipal != null || oGroupPrincipal != null)
            {
                if (!IsUserGroupMember(userName, groupName))
                {
                    oGroupPrincipal.Members.Add(oUserPrincipal);
                    oGroupPrincipal.Save();
                }
            }
            return "Success";
        }
        catch (Exception ex)
        {
            return "Failure";
        }
    }

    private bool IsUserGroupMember(string userName, string groupName)
    {
        try
        {
            UserPrincipal oUserPrincipal = GetUser(userName);
            GroupPrincipal oGroupPrincipal = GetGroup(groupName);
            return oGroupPrincipal.Members.Contains(oUserPrincipal);
        }
        catch (Exception ex)
        {
            return false;
        }
    }

    private GroupPrincipal GetGroup(string groupName)
    {
        PrincipalContext oPrincipalContext = GetPrincipalContext();

        GroupPrincipal oGroupPrincipal =
           GroupPrincipal.FindByIdentity(oPrincipalContext, sGroupName);
        return oGroupPrincipal;
    }

    private PrincipalContext GetPrincipalContext()
    {
        PrincipalContext principalContext = new PrincipalContext(ContextType.Domain, domain, ConfigurationManager.AppSettings["defaultOUForSearch"], serviceUser, servicePassword);
        return principalContext;
    }

    private UserPrincipal GetUser(string userName)
    {
        PrincipalContext oPrincipalContext = GetPrincipalContext();
        UserPrincipal oUserPrincipal = UserPrincipal.FindByIdentity(oPrincipalContext, userName);
        return oUserPrincipal;
    }
}