ohbuttc#

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 Calculator
{
    public partial class Calculator : Form
    {
        public Calculator()
        {
            InitializeComponent();
        }
        bool Clear = true; //determines if the label should be cleared for new input
        double firstInput; // first input
        double secondInput; // second input
        double result = 0; // result of first and second input
        string operatorSymbol; // holds the operator symbol for each calculation

        private void btn0_Click(object sender, EventArgs e)
        {
            lblDisplay.Text = lblDisplay.Text + "0";
        }
        private void btn1_Click(object sender, EventArgs e)
        {
            lblDisplay.Text = lblDisplay.Text + "1";
        }
        private void btn2_Click(object sender, EventArgs e)
        {
            lblDisplay.Text = lblDisplay.Text + "2";
        }
        private void btn3_Click(object sender, EventArgs e)
        {
            lblDisplay.Text = lblDisplay.Text + "3";
        }
        private void btn4_Click(object sender, EventArgs e)
        {
            lblDisplay.Text = lblDisplay.Text + "4";
        }
        private void btn5_Click(object sender, EventArgs e)
        {
            lblDisplay.Text = lblDisplay.Text + "5";
        }
        private void btn6_Click(object sender, EventArgs e)
        {
            lblDisplay.Text = lblDisplay.Text + "6";
        }
        private void btn7_Click(object sender, EventArgs e)
        {
            lblDisplay.Text = lblDisplay.Text + "7";
        }
        private void btn8_Click(object sender, EventArgs e)
        {
            lblDisplay.Text = lblDisplay.Text + "8";
        }
        private void btn9_Click(object sender, EventArgs e)
        {
            lblDisplay.Text = lblDisplay.Text + "9";
        }
        private void btnDecimal_Click(object sender, EventArgs e)
        {
            lblDisplay.Text = lblDisplay.Text + ".";
            btnDecimal.Enabled = false;
        }
        private void btnBackspace_Click(object sender, EventArgs e)
        {
            if (lblDisplay.Text.Length >= 2)
            {
                lblDisplay.Text = lblDisplay.Text.Remove(lblDisplay.Text.Length - 1);
            }
            else
            {
                lblDisplay.Text = "0";
                btnDecimal.Enabled = true;
            }
        }
        private void btnClear_Click(object sender, EventArgs e)
        {
            lblDisplay.Text = "0";
            btnDecimal.Enabled = true;
            firstInput = 0;
            secondInput = 0;
        }

        private void btnPlus_Click(object sender, EventArgs e)
        {
            firstInput = double.Parse(lblDisplay.Text);
            operatorSymbol = "+";
            lblDisplay.Text = "0";
        }

        private void btnMinus_Click(object sender, EventArgs e)
        {
            firstInput = double.Parse(lblDisplay.Text);
            operatorSymbol = "-";
            lblDisplay.Text = "0";
        }

        private void btnMultiply_Click(object sender, EventArgs e)
        {
            firstInput = double.Parse(lblDisplay.Text);
            operatorSymbol = "*";
            lblDisplay.Text = "0";
        }

        private void btnDivide_Click(object sender, EventArgs e)
        {
            firstInput = double.Parse(lblDisplay.Text);
            operatorSymbol = "/";
            lblDisplay.Text = "0";
        }

        private void btnEquals_Click(object sender, EventArgs e)
        {
            secondInput = double.Parse(lblDisplay.Text);
            switch (operatorSymbol)
            {
                case "+":
                    result = firstInput + secondInput;
                    operatorSymbol = "";
                    break;
                case "-":
                    result = firstInput - secondInput;
                    operatorSymbol = "";
                    break;
                case "*":
                    result = firstInput * secondInput;
                    operatorSymbol = "";
                    break;
                case "/":
                    result = firstInput / secondInput;
                    operatorSymbol = "";
                    break;
            }
            lblDisplay.Text = result.ToString();
        }
    }
}