Untitled

namespace Simple_Calculator
{
    public partial class Form1 : Form
    {
        private decimal valueFirst = 0.0m;
        private decimal valueSecond = 0.0m;
        private decimal Result = 0.0m;
        private decimal operators = '+';
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void ZeroBtn_Click(object sender, EventArgs e)
        {
            if (textBox.Text == "0")
            {
                textBox.Text = "0";
            }
            else
            {
                textBox.Text += "0";
            }
        }

        private void DotBtn_Click(object sender, EventArgs e)
        {
            if (!textBox.Text.Contains("."))
            {
                textBox.Text += ".";
            }
        }

        private void OneBtn_Click(object sender, EventArgs e)
        {
            if (textBox.Text == "0")
            {
                textBox.Text = "1";
            }
            else
            { textBox.Text += "1"; }
        }

        private void TwoBtn_Click(object sender, EventArgs e)
        {
            if (textBox.Text == "0")
            {
                textBox.Text = "2";
            }
            else
            { textBox.Text += "2"; }
        }

        private void ThreeBtn_Click(object sender, EventArgs e)
        {
            if (textBox.Text == "0")
            {
                textBox.Text = "3";
            }
            else
            { textBox.Text += "3"; }
        }

        private void FourBtn_Click(object sender, EventArgs e)
        {
            if (textBox.Text == "0")
            {
                textBox.Text = "4";
            }
            else
            { textBox.Text += "4"; }
        }

        private void FiveBtn_Click(object sender, EventArgs e)
        {
            if (textBox.Text == "0")
            {
                textBox.Text = "5";
            }
            else
            { textBox.Text += "5"; }
        }

        private void SixBtn_Click(object sender, EventArgs e)
        {
            if (textBox.Text == "0")
            {
                textBox.Text = "6";
            }
            else
            { textBox.Text += "6"; }
        }

        private void SevenBtn_Click(object sender, EventArgs e)
        {
            if (textBox.Text == "0")
            {
                textBox.Text = "7";
            }
            else
            { textBox.Text += "7"; }
        }

        private void EightBtn_Click(object sender, EventArgs e)
        {
            if (textBox.Text == "0")
            {
                textBox.Text = "8";
            }
            else
            { textBox.Text += "8"; }
        }

        private void NineBtn_Click(object sender, EventArgs e)
        {
            if (textBox.Text == "0")
            {
                textBox.Text = "9";
            }
            else
            { textBox.Text += "9"; }
        }

        private void PlusMinusBtn_Click(object sender, EventArgs e)
        {
            if (textBox.Text.Contains("-"))
            {

                textBox.Text = textBox.Text.Trim('-');
            }
            else
            {
                textBox.Text = "-" + textBox.Text;
            }
        }

        private void SubtractionBtn_Click(object sender, EventArgs e)
        {
            valueFirst = decimal.Parse(textBox.Text);
            textBox.Clear();
            operators = '-';
        }

        private void AdditionBtn_Click(object sender, EventArgs e)
        {
            valueFirst = decimal.Parse(textBox.Text);
            textBox.Clear();
            operators = '+';
        }

        private void DivitionBtn_Click(object sender, EventArgs e)
        {
            valueFirst = decimal.Parse(textBox.Text);
            textBox.Clear();
            operators = '/';
        }

        private void MultiplicationBtn_Click(object sender, EventArgs e)
        {
            valueFirst = decimal.Parse(textBox.Text);
            textBox.Clear();
            operators = '*';
        }

        private void EqualBtn_Click(object sender, EventArgs e)
        {
            switch (operators)
            {
                case '-':
                    valueSecond = decimal.Parse(textBox.Text);
                    Result = valueFirst - valueSecond;
                    textBox.Text = Result.ToString();
                    break;
                case '+':
                    valueSecond = decimal.Parse(textBox.Text);
                    Result = valueFirst + valueSecond;
                    textBox.Text = Result.ToString();
                    break;
                case '*':
                    valueSecond = decimal.Parse(textBox.Text);
                    Result = valueFirst * valueSecond;
                    textBox.Text = Result.ToString();
                    break;
                case '/':
                    valueSecond = decimal.Parse(textBox.Text);
                    Result = valueFirst / valueSecond;
                    textBox.Text = Result.ToString();
                    break;
            }
        }

        private void ClearBtn_Click(object sender, EventArgs e)
        {
            valueFirst = 0.0m;
            valueSecond = 0.0m;
            textBox.Text = "0";
        }
    }
}