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Add users to SharePoint Group

private void AddSPUsers()
{
using (SPSite site = new SPSite("http://syntaxhelpintranetportal.com"))
{
  using (SPWeb web = site.OpenWeb())
  {
    string login = "forms:UserName";
    string groupName = "Group";
    SPUser user = web.EnsureUser(login);
    SPGroup group = web.Groups[];
    group.AddUser(user);
  }
}
}