How to get a list of all users in SharePoint

Question

How to get a list of all users in a certain group in SharePoint by code?

Answer 1

using (SPWeb oWebsite = SPContext.Current.Site.OpenWeb("Website_URL"))
{
    SPGroupCollection collGroups = oWebsite.Groups;
    foreach (SPGroup oGroup in collGroups)
    {
        foreach(SPUser oUser in oGroup.Users)
        {
           Response.Write(oUser.Name);
        }
    }
}