SQL in() 和base.Dispose(disposing)的问题求助。。。

 

       public DataSet get_doc(string cuid,int doctype)

        {

            SqlParameter[] pars ={

            MakeInParam("@cuid",SqlDbType.NVarChar,200,cuid),

            MakeInParam("@doctype",SqlDbType.TinyInt,4,doctype),

            };

            return RunProc("select a.*, b.flow_name, c.node_name, c.node_type_id, c.node_order_id, c.node_next_id  from t_doc a, t_flow b, t_node c  where a.df = 0  and a.cu in (@cuid)  and a.st in ( 0,1,4 ) and a.doc_type = @doctype  and a.flow_id *= b.flow_id  and a.node_id *= c.node_id order by a.doc_id desc", pars, "t_doc123");

        }

        public DataSet RunProc(string procN, SqlParameter[] prams, string tbN)

        {

            SqlDataAdapter dap = CreateDataAdaper(procN, prams);

            DataSet ds = new DataSet();

            dap.Fill(ds, tbN);

            this.Close();

            return ds;

        }

private SqlDataAdapter CreateDataAdaper(string procN, SqlParameter[] prams)

        {

            this.Open();

            SqlDataAdapter dap = new SqlDataAdapter(procN,con);

            dap.SelectCommand.CommandType = CommandType.Text;  

      if (prams != null)

            {

                foreach (SqlParameter parameter in prams)

                    dap.SelectCommand.Parameters.Add(parameter);

            }

             dap.SelectCommand.Parameters.Add(new SqlParameter("ReturnValue", SqlDbType.Int, 4,

                ParameterDirection.ReturnValue, false, 0, 0,

                string.Empty, DataRowVersion.Default, null));



            return dap;

        }

问题出在这个语句:
select a.*, b.flow_name, c.node_name, c.node_type_id, c.node_order_id, c.node_next_id from t_doc a, t_flow b, t_node c where a.df = 0 and a.cu in (@cuid) and a.st in ( 0,1,4 ) and a.doc_type = @doctype and a.flow_id *= b.flow_id and a.node_id *= c.node_id order by a.doc_id desc
的in (@cuid)
程序会跳到：

protected override void Dispose(bool disposing)

        {

            if (disposing && (components != null))

            {

                components.Dispose();

            }

            base.Dispose(disposing);

        }

如果不传参数，直接in(1,2,3,4)这样。程序就没问题了。
请问有为什么和怎么解决呢？