Retrive A File From A Binary Data Field

hello dear friends

I am trying to save a binary file to database with the following code:

public static void memorystreamToDb()

{

          MemoryStream mst = new MemoryStream();

          UnicodeEncoding u = new UnicodeEncoding();

          string Textn = "Test";

          byte[] b = u.GetBytes(Textn);

          mst.Write(b ,0,Textn.Length );

          BinaryReader reader = new BinaryReader(mst);

          byte[] file = reader.ReadBytes((int)mst.Length);

          using (SqlConnection connection = new SqlConnection("Some Connection String"))

          {

                    SqlCommand command = new SqlCommand("INSERT INTO temp (examplefile) Values(@File)", connection);

                    command.Parameters.Add("@File", SqlDbType.Binary, file.Length).Value = file;

                    connection.Open();

                    command.ExecuteNonQuery();

          }

          reader.Close();

          mst.Close();

}

or with the other method from a real file (not memory stream)

public static void Addfile(string path)

{

          CommonMethods_class k = new CommonMethods_class();

          byte[] file = GetFile(path);

          using (SqlConnection connection = new SqlConnection(k.Get_connection_string()))

          {

                    SqlCommand command = new SqlCommand("INSERT INTO temp (examplefile) Values(@File)", connection);

                    command.Parameters.Add("@File", SqlDbType.Binary, file.Length).Value = file;

                    connection.Open();

                    command.ExecuteNonQuery();

          }

}

and after running each of them seams that the file have been saved; but I can not retrive the files. I have tried some solutions from msdn but inside the created file is empty. the point that i really look for it is to just working with memory not in the disk before saving. and then retriving each field that I want.

looking forward your points

thank you in advance