C# program converting Fahrenheit/Celsius/Kelvin

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        private void Fahrenheit_Click(object sender, EventArgs e)
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        {
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           double dblCelsius;
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           double dblFahrenheit;
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            dblCelsius = double.Parse(Fahrenheit.Text);
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            dblFahrenheit = (Celsius * 9 / 5) + 32;
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            Celsius.Text= Convert.ToString(dblCelsius);
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        }


        private void Celsius_Click(object sender, EventArgs e)

        {

            double dblFahrenheit;

            double dblCelsius;


            dblFahrenheit = double.Parse(Celsius.Text);

            dblCelsius = (Fahrenheit - 32) * 5 / 9;

            Fahrenheit.Text = Convert.ToString(dblFahrenheit);


        }


        private void button1_Click(object sender, EventArgs e)

        {

            Application.Exit();