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, ));
                 //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;
     }