Convert.ToInt32(cmd.ExecuteObject()) > 0 ? true : false

//判断会员是否存在

 public bool JudgeCardNoExist(string cardno)

{

 SqlSqlCommand cmd = new SqlSqlCommand();

 string sql="select count(*) from sanlian.mem_member where card_no='"+cardno+"' and card_type='1'";

 cmd.SqlText=sql;

 return Convert.ToInt32(cmd.ExecuteObject()) > 0  true : false;

}

   public object ExecuteObject()

{

 PrepareCommand();

      try{

 recordCmd.Connection.Open();

 return recordCmd.ExecuteScalar(); //返回第一行第一列}

      catch (Exception ex){  throw ex;}

      finally{recordCmd.Connection.Close();}

}