asp.net中C#调用存储过程

创建存储过程：

create procedure houseCount
(
  @house_state nvarchar(20),
  @house_count int output
)
as
select @house_count=COUNT(*) from house where house_state=@house_state

sql执行存储过程：
declare @house_count int
execute houseCount '空房',@house_count output select @house_count

C#调用存储过程：

protected void Page_Load(object sender, EventArgs e)
    {
        string count_house = ProcedureCount("空房");
        Response.Write(string.Format(count_house));
    }
    //调用存储过程
    public string ProcedureCount(string house) 
    {
        string count_house = "";
        string strConnection = "user id=sa;password=sa;initial catalog=houseState;Server=127.0.0.1;Connect Timeout=30";
        using (SqlConnection conn = new SqlConnection(strConnection))
        {
            conn.Open();
            using (SqlCommand sqlComm = conn.CreateCommand())
            {
                //设置要调用的存储过程的名称  
                sqlComm.CommandText = "houseCount";
                //指定SqlCommand对象传给数据库的是存储过程的名称而不是sql语句  
                sqlComm.CommandType = CommandType.StoredProcedure;

                SqlParameter username = sqlComm.Parameters.Add(new SqlParameter("@house_state", SqlDbType.VarChar, 20));
                //指明"@username"是输入参数  
                username.Direction = ParameterDirection.Input;
                //为“@username”参数赋值  
                username.Value =house;

                SqlParameter password = sqlComm.Parameters.Add(new SqlParameter("@house_count", SqlDbType.Int));
                //指定"@password"为输出参数  
                password.Direction = ParameterDirection.Output;
                //执行  
                sqlComm.ExecuteNonQuery();
                //得到输出参数的值,把赋值给name,注意,这里得到的是object类型的,要进行相应的类型轮换  
                count_house = sqlComm.Parameters["@house_count"].Value.ToString();
                
            }
        }
        return count_house;
    }