过程需要参数“”但未提供该参数！！存储过程的问题！求救！

做了个简单的三层，向数据库中添加东西，用得存储过程，因为不太熟悉，所以一直出现问题，但是我却不知道究竟什么地方出现了问题！请教大家！

DAL层代码：

 public int InsertNews(Model.articlemodel SingleNews)

         {

           

                string procname = "dbo.addnews";

                SqlParameter[] prames ={ 

                                          new SqlParameter("@title",SqlDbType.NVarChar,50),

                                          new SqlParameter("@news_time",SqlDbType.DateTime),

                                          new SqlParameter("@news_from",SqlDbType.NVarChar,50),

                                          new SqlParameter("@news_class",SqlDbType.NVarChar,50),

                                          new SqlParameter("@news_content",SqlDbType.NVarChar,200)};

                prames[0].Value = SingleNews.title;

                prames[1].Value = SingleNews.news_time;

                prames[2].Value = SingleNews.news_from;

                prames[3].Value = SingleNews.news_class;

                prames[4].Value = SingleNews.news_content;

                int intResult = DBUtility.DataBase.RunExecute(procname,prames);//后面注释部分

                return intResult;

           

               // public static int RunExecute(string procName, SqlParameter[] prames)

        {

            SqlConnection conn = DBHelp.GetConn();

            SqlCommand cmd = new SqlCommand();

            cmd.CommandType = CommandType.StoredProcedure;

            cmd.Connection = conn;

            cmd.CommandText = procName;

            conn.Open();

            int intResult = cmd.ExecuteNonQuery();

            conn.Close();

            return intResult;

        }

            

           

        }

BLL层：

public bool InsertNews(string title,DateTime news_time,string news_from,string news_class,string news_content)

        {

            bool Flage = false;

            Dal.articledal ee = new Dal.articledal();

            Model.articlemodel SingleNews = new Model.articlemodel();

            SingleNews.title = title;

            SingleNews.news_time = news_time;

            SingleNews.news_from = news_from;

            SingleNews.news_class = news_class;

            SingleNews.news_content = news_content;

            int intresult=ee.InsertNews(SingleNews);

            if (intresult > 0)

            {

                Flage = true;

            }

           

            return Flage;

        }

WEB层:

protected void BtnAddNews_Click(object sender, EventArgs e)

        {

            string title = this.Txttitle.Text;

            DateTime news_time = System.DateTime.Now;

            string news_from = this.Txtnewsfrom.Text;

            string news_class = this.DropDownList1.SelectedValue;

            string news_content = this.Txtnewscontent.Text;

            Bll.articlebll bll = new Bll.articlebll();

            bool s=bll.InsertNews(title,news_time,news_from,news_class,news_content);

           

              if (s)

              {

                  LabMessage.Text = "添加新闻成功！";

              }

              else

              {

                  LabMessage.Text = "抱歉，新闻添加失败！";

              }

       

        }

存储过程如下：
ALTER PROCEDURE dbo.addnews

(
@title nvarchar(50)=erererrwrwer,
@news_time datetime,
@news_from nvarchar(50)=dgdgdgdfg,
@news_class nvarchar(50)=dfdgdgfgfg,
@news_content nvarchar(200)=fgggggggg
)

AS
insert into article(title,news_time,news_from,news_class,news_content) values(@title,@news_time,@news_from,@news_class,@news_content)
RETURN
（应该是参数没有传递给存储过程，但是我看了半天也没有发现究竟哪里的代码出现了问题，请帮忙看一下，你的举手之劳，就能解决我好几天的困惑！谢谢）