Get the Groups from Active Directory using c#

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C#

i want to get the group from the active directory and then from the group i want to find the members of that group

but when i search for solution i got groups via users who are belongs to which group

i am using winnt

PrincipalContext ctx = new PrincipalContext(ContextType.Domain); // create ctx

using (ctx)
{
 Principal p1 = Principal.FindByIdentity(ctx, child.Name); // get Principal for the current user

    using (p1)
    {
                                                    
       var groups = p1.GetGroups();
       using (groups)
       {
       foreach (Principal group in groups) // cycle through all the groups for this user
       {
              // get group list 
                                                      
       } // end using (groups)

     } // end using (p)

this is my code in this code i am getting the group associated with users but i want to get group and that group belongs user

help me to solve this.