Calculator [FIXED]

//Описание:
//C#: Калькулятор
//(C) Alex.Devil.LX 2011
//http://alexdevillx.blogspot.com

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 Калькулятор
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        Double Number1;
        Double Number2;
        Double Result;
        String OutputResult;
        String MathOperator;
        private void Form1_Load(object sender, EventArgs e)
        {
            textBox1.Text = "";
        }

        private void AboutLink_Click(object sender, EventArgs e)
        {
            AboutBox1 CallAboutBox = new AboutBox1();
            CallAboutBox.Show();
        }
        private void SourceCodeLink_Click(object sender, EventArgs e)
        {
            System.Diagnostics.Process.Start("IExplore.exe", "http://alexdevillx.blogspot.com");
        }
        private void Clear_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
        }
        private void Num_Dot_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "") textBox1.Text = textBox1.Text + "";
            else textBox1.Text = textBox1.Text + ",";
        }
        private void Num_0_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "0") textBox1.Text = textBox1.Text + "";
            else textBox1.Text = textBox1.Text + "0";
        }
        private void Num_1_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "1";
        }
        private void Num_2_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "2";
        }
        private void Num_3_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "3";
        }
        private void Num_4_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "4";
        }
        private void Num_5_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "5";
        }
        private void Num_6_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "6";
        }
        private void Num_7_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "7";
        }
        private void Num_8_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "8";
        }
        private void Num_9_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "9";
        }

        private void Operator_Plus_Click(object sender, EventArgs e)
        {
            Number1 = Double.Parse(textBox1.Text);
            MathOperator = "+";
            textBox1.Text = "";
        }
        private void Operator_Minus_Click(object sender, EventArgs e)
        {
            Number1 = Double.Parse(textBox1.Text);
            MathOperator = "-";
            textBox1.Text = "";

        }
        private void Operator_Multiply_Click(object sender, EventArgs e)
        {
            Number1 = Double.Parse(textBox1.Text);
            MathOperator = "*";
            textBox1.Text = "";
        }
        private void Operator_Divide_Click(object sender, EventArgs e)
        {
            Number1 = Double.Parse(textBox1.Text);
            MathOperator = "/";
            textBox1.Text = "";
        }
        private void Operator_Squareroot_Click(object sender, EventArgs e)
        {
            Number1 = Double.Parse(textBox1.Text);
            MathOperator = "Sqrt";
            textBox1.Text = "";
        }
        private void Operator_Prs_Click(object sender, EventArgs e)
        {
            Number1 = Double.Parse(textBox1.Text);
            MathOperator = "%";
            textBox1.Text = "";
        }
        private void Operator_Equals_Click(object sender, EventArgs e)
        {
            Number2 = double.Parse(textBox1.Text);
            if (MathOperator == "+") Result = Number1 + Number2;
            if (MathOperator == "-") Result = Number1 - Number2;
            if (MathOperator == "*") Result = Number1 * Number2;
            if (MathOperator == "/") Result = Number1 / Number2;
            if (MathOperator == "Sqrt") Result = Math.Sqrt(Number1);
            if (MathOperator == "%") Result = (Number1 / Number2)*100;
            OutputResult = Result.ToString();
            textBox1.Text = OutputResult;
        }
    }
}