How to Get Users from AD Group & Sharepoint Group ?

AD Group Users :-
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Add Reference from .NET tab or Browse the following location & add the dll.

C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\ISAPI\microsoft.office.workflow.tasks.dll

using Microsoft.Office.Workflow.Utility; 

Contact c = Contact.FromName("Server Name\\Group Name", Myweb);

if (c != null)

{               

Contact[] contacts = new Contact[] { c };

bool reachedMaxCount = false;

contacts = Contact.ExpandGroups(Myweb, contacts, 100, out reachedMaxCount);

}

The Above Contact Array getting memeber of the group.

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Sharepoint Group Users :-

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private static void GetUsersGroups()

{ 

    using (SPSite site = new SPSite("http://sitename"))

    {

        SPWeb web = site.OpenWeb();

        SPGroupCollection groupCollection = web.SiteGroups;

                

        foreach (SPGroup group in groupCollection)

        {

            SPUserCollection userCollection = group.Users;

            Console.WriteLine("Group Name :" + group.Name+"\n");

                    

            foreach (SPUser user in userCollection)

            {

                Console.WriteLine("User Name: " + user.Name + " Email: " + user.Email + " Login: " + user.LoginName);

            }

        }

        //Iterate the owners group

        SPGroup ownerGroup = web.AssociatedOwnerGroup;              

        foreach (SPUser ownerUser in ownerGroup.Users)

        {

            Console.WriteLine("User Name: " + ownerUser.Name + " Email: " + ownerUser.Email + " Login: " + ownerUser.LoginName);

        }

    }

    Console.ReadLine();

}