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public int ExecProcAdd()
        {
            SqlCommand cmd = new SqlCommand();
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandText = "adduser";//Äõ½´æ´¢¹ý³ÌµÄÃû×Ö
//--------------------------------´ø²ÎÊýµÄ´æ´¢¹ý³Ì(3¸ö)-----------------------------------------
            SqlParameter p1 = new SqlParameter("@username",typeof(string));
            SqlParameter p2 = new SqlParameter("@userpwd",typeof(string));
//-----------------------------------------------------------------------------------------
  //ÓÃsqldbtype.int²»»á³ö´í£¬×îºÃÓÃËü
            SqlParameter p3 = new SqlParameter("@userid",SqlDbType.Int);
            //Óзµ»ØÖµµÄ´æ´¢¹ý³Ì
     p3.Direction = ParameterDirection.Output;
            p1.Value = "ÕÅÈý";//¸ø´øµÄ²ÎÊý¸³Öµ
            p2.Value = "123456";
      
          //½«Æä¼ÓÈëµ½
            cmd.Parameters.Add(p1);
            cmd.Parameters.Add(p2);
            cmd.Parameters.Add(p3);
            cmd.Connection = Conn;
//-------------------------------------------------------------