★★☆☆☎大虾救急一下·帮忙看下C#程序的错误怎么改？（简【c#吧】

我的电脑用的是VSC#2005半的刚刚做的一个简易计算器程序，小数点部分可以重复输入怎么改？还有，bug怎么用？我是初学者各位大虾帮帮忙using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace calculator
{
public partial class frmcalcul : Form
{
public frmcalcul()
{
InitializeComponent();
}
public int Opercode; //声明运算符
public float starter, middle, ender;
public int Count; //点击次数
/// <summary>
/// 分别做加、减、乘、除、取余运算
/// </summary>
public void Calculate()
{
try
{
switch (Opercode)
{
case 1:
ender = starter + middle;
txtInput.Text = ender.ToString();
break;
case 2:
ender = starter - middle;
txtInput.Text = ender.ToString();
break;
case 3:
ender = starter * middle;
txtInput.Text = ender.ToString();
break;
case 4:
if (middle == 0)
{
MessageBox.Show("除数不能为 0 ","有没有搞错？！！");
break;
}
ender = starter / middle;
txtInput.Text = ender.ToString();
break;
case 5:
ender = starter % middle;
txtInput.Text = ender.ToString();
break;
}
}
catch
{
MessageBox.Show("输入错误！","提示");
}
}
/// <summary>
/// 将上次运算结果清空
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void frmcalcul_Load(object sender, EventArgs e)
{
}
private void btnRestor_Click(object sender, EventArgs e)
{
txtInput.Text = null;
txtInput.Text = null;
txtInput.Focus();
}
private void btnBack_Click(object sender, EventArgs e)
{
string showNumber;
float tmp;
showNumber = txtInput.Text;
if (txtInput.Text.Length > 1)
{
txtInput.Text = showNumber.Substring(0, showNumber.Length - 1);
tmp = float.Parse(txtInput.Text);

}
else
{
txtInput.Text = "0.";
tmp = 0;
}
}
private void btnAdd_Click(object sender, EventArgs e)
{
try
{
Opercode = 1;
starter = float.Parse(txtInput.Text);
txtInput.Text = null;
}
catch
{
this.txtInput.Text = ("");
}
}
private void btnDec_Click(object sender, EventArgs e)
{
try
{
Opercode = 2;
starter = float.Parse(txtInput.Text);
txtInput.Text = null;
}
catch
{
this.txtInput.Text = ("");
}
}
private void btnMul_Click(object sender, EventArgs e)
{
try
{
Opercode = 3;
starter = float.Parse(txtInput.Text);
txtInput.Text = null;
}
catch
{
this.txtInput.Text = ("");
}
}
private void btnDiv_Click(object sender, EventArgs e)
{
try
{
Opercode = 4;
starter = float.Parse(txtInput.Text);
txtInput.Text = null;
}
catch
{
this.txtInput.Text = ("");
}
}
private void btnRemain_Click(object sender, EventArgs e)
{
}
private void btn_1_Click(object sender, EventArgs e)
{
if (Count <= 0)
txtInput.Text = null;
Count++;
txtInput.Text = (txtInput.Text + "1");
}
private void btn_2_Click(object sender, EventArgs e)
{
if (Count <= 0)
txtInput.Text = null;
Count++;
txtInput.Text = (txtInput.Text + "2");
}
private void btn_3_Click(object sender, EventArgs e)
{
if (Count <= 0)
txtInput.Text = null;
Count++;
txtInput.Text = (txtInput.Text + "3");
}
private void btn_4_Click(object sender, EventArgs e)
{
if (Count <= 0)
txtInput.Text = null;
Count++;
txtInput.Text = (txtInput.Text + "4");
}
private void btn_5_Click(object sender, EventArgs e)
{
if (Count <= 0)
txtInput.Text = null;
Count++;
txtInput.Text = (txtInput.Text + "5");
}
private void btn_6_Click(object sender, EventArgs e)
{
if (Count <= 0)
txtInput.Text = null;
Count++;
txtInput.Text = (txtInput.Text + "6");
}
private void btn_7_Click(object sender, EventArgs e)
{
if (Count <= 0)
txtInput.Text = null;
Count++;
txtInput.Text = (txtInput.Text + "7");
}
private void btn_8_Click(object sender, EventArgs e)
{
if (Count <= 0)
txtInput.Text = null;
Count++;
txtInput.Text = (txtInput.Text + "8");
}
private void btn_9_Click(object sender, EventArgs e)
{
if (Count <= 0)
txtInput.Text = null;
Count++;
txtInput.Text = (txtInput.Text + "9");
}
private void btn_0_Click(object sender, EventArgs e)
{
if (Count <= 0)
txtInput.Text = null;
Count++;
txtInput.Text = (txtInput.Text + "0");
}
private void btnResult_Click(object sender, EventArgs e)
{
try
{
middle = float.Parse(txtInput.Text);
Calculate();
Count = 0;
}
catch
{
txtInput.Text = ("");
}
}
private void btnCount_Click(object sender, EventArgs e)
{
if (Count != 0)
{
txtInput.Text = txtInput.Text + "."; ◀◀☜就是这里
╭＾＾＾╮
{/ @ @ /}
( (oo) )
）））
}
}
}
}

我的问题很正常啊？为什么没有人回答啊？？？

日	一	二	三	四	五	六

★★☆☆☎大虾救急一下·帮忙看下C#程序的错误怎么改？（简

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