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Question

1)
DirectoryInfo d = new DirectoryInfo(Server.MapPath(@"./MYDIR"));
if (! d.Exists) d.Create();2)
string HTML = "xxxxx";
string fileFullName = Server.MapPath(@"./MYDIR/MYFILE.HTM");
FileStream ObjFile = new FileStream(fileFullName,FileMode.Create,FileAccess.Write,FileShare.Read);
StreamWriter sw = new StreamWriter(ObjFile,System.Text.Encoding.Default);
sw.Write(HTML);
sw.Close();
ObjFile.Close();

Answer 1

System.IO.Directory.CreateDirectory("路径名");