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Сообщение от belugin

судя по описанию, это - строковая rконстанта и ее значение можно посмотреть в Visual STudio

Это методы протокола FTP. Здесь http://msdn.microsoft.com/en-us/libr...p_members.aspx приводятся их текстовые значения.

Студия для того, чтобы посмотреть исходники библиотеки, не обязательна. Есть прекрасная утилита Reflector. С ее помощью можно увидеть такую картину для типа System.Net.WebRequestMethods.Ftp:

/// <summary>Represents the types of FTP protocol methods that can be used with an FTP request. This class cannot be inherited.</summary>
public static class Ftp
{
    /// <summary>Represents the FTP APPE protocol method that is used to append a file to an existing file on an FTP server.</summary>
    public const string AppendFile = "APPE";
    /// <summary>Represents the FTP DELE protocol method that is used to delete a file on an FTP server.</summary>
    public const string DeleteFile = "DELE";
    /// <summary>Represents the FTP RETR protocol method that is used to download a file from an FTP server.</summary>
    public const string DownloadFile = "RETR";
    public const string GetDateTimestamp = "MDTM";
    /// <summary>Represents the FTP SIZE protocol method that is used to retrieve the size of a file on an FTP server.</summary>
    public const string GetFileSize = "SIZE";
    /// <summary>Represents the FTP NLIST protocol method that gets a short listing of the files on an FTP server.</summary>
    public const string ListDirectory = "NLST";
    /// <summary>Represents the FTP LIST protocol method that gets a detailed listing of the files on an FTP server.</summary>
    public const string ListDirectoryDetails = "LIST";
    /// <summary>Represents the FTP MKD protocol method creates a directory on an FTP server.</summary>
    public const string MakeDirectory = "MKD";
    /// <summary>Represents the FTP PWD protocol method that prints the name of the current working directory.</summary>
    public const string PrintWorkingDirectory = "PWD";
    /// <summary>Represents the FTP RMD protocol method that removes a directory.</summary>
    public const string RemoveDirectory = "RMD";
    /// <summary>Represents the FTP RENAME protocol method that renames a directory.</summary>
    public const string Rename = "RENAME";
    /// <summary>Represents the FTP STOR protocol method that uploads a file to an FTP server.</summary>
    public const string UploadFile = "STOR";
    /// <summary>Represents the FTP STOU protocol that uploads a file with a unique name to an FTP server.</summary>
    public const string UploadFileWithUniqueName = "STOU";
}