/// <summary>
/// Advances the current article pointer to the next article.
/// </summary>
/// <returns>The server's response.</returns>
/// <example>
/// <code>
/// C#
///
/// NntpClient nntp = new NntpClient();
///
/// nntp.Connect("news.myhost.com");
///
/// NewsGroup group = nntp.SelectGroup("mygroup");
/// //group.Pointer is equal to group.FirstArticle.
/// group.Next();
/// //group.Pointer is now equal to group.FirstArticle + 1.
/// //Retrieve the second article in this group.
/// Message article2 = group.RetrieveArticleObject();
///
/// nntp.Disconnect();
///
/// VB.NET
///
/// Dim nntp As New NntpClient
///
/// nntp.Connect("news.myhost.com")
///
/// Dim group As NewsGroup = nntp.SelectGroup("mygroup")
/// 'group.Pointer is equal to group.FirstArticle.
/// group.Next()
/// 'group.Pointer is now equal to group.FirstArticle + 1.
/// 'Retrieve the second article in this group.
/// Dim article2 As Message = group.RetrieveArticleObject()
///
/// nntp.Disconnect()
///
/// JScript.NET
///
/// var nntp:NntpClient = new NntpClient();
///
/// nntp.Connect("news.myhost.com");
///
/// var group:NewsGroup = nntp.SelectGroup("mygroup");
/// //group.Pointer is equal to group.FirstArticle.
/// group.Next();
/// //group.Pointer is now equal to group.FirstArticle + 1.
/// //Retrieve the second article in this group.
/// var article2:Message = group.RetrieveArticleObject();
///
/// nntp.Disconnect();
/// </code>
/// </example>
public string Next()
{
string response = _nntp.Command("next");
if (response.StartsWith("223"))
{
Pointer = Convert.ToInt32(response.Split(' ')[1]);
}
return(response);
}