sql server2005返回值问题

(1)关于存储过程返回值问题（output,ruturn）
  output存储过程：
  
alter proc usp_update
@count int output
as
set @count=(select count(*) from stu)
   
 return存储过程：
alter proc usp_update
as
declare @count int
set @count=(select count(*) from stu)
return @count
  
.net代码（output）：
        SqlConnection con = new SqlConnection        ("server=95F188CF1A24424;uid=jinzhiyuan;pwd=jinzhiyuan;database=student");
        con.Open();
        SqlCommand cmd = new SqlCommand("usp_update",con);
        cmd.Parameters.Add("@count", SqlDbType.Int);
        cmd.CommandType = CommandType.StoredProcedure;
     
        cmd.Parameters["@count"].Direction = ParameterDirection.Output;
        cmd.ExecuteNonQuery();
      
        int j=(int)cmd.Parameters["@count"].Value;
        Response.Write("我是刚刚才执行的值："+j);
        con.Close();
.net代码（return）
        SqlConnection con = new SqlConnection("server=95F188CF1A24424;uid=jinzhiyuan;pwd=jinzhiyuan;database=student");
        con.Open();
        SqlCommand cmd = new SqlCommand("usp_update",con);
        cmd.Parameters.Add("@count", SqlDbType.Int);
        cmd.CommandType = CommandType.StoredProcedure;
     
        cmd.Parameters["@count"].Direction = ParameterDirection.Ret