简单的C#计算器源码资源

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace HaoltCalculator
...{
    public partial class _MainFrm : Form
    ...{
        private double nPrevValue = 0;//上一次值
        private bool bAppend = true;//用户按的数字是否连接在显示的数字后面
        private string strPrevOpar = "";//上一次的操作符号

        public _MainFrm()
        ...{
            InitializeComponent();
        }

        private void NumButton_Click(object sender, EventArgs e)
        ...{
            if (bAppend)...{//在追加状态
                Button btn = sender as Button;
                if (btn.Text=="0")...{
                    if (textBoxResult.Text == "") ...{
                        textBoxResult.Text += "0";
                    } else if(textBoxResult.Text == "0")...{