#### Events and eventhandlers

We need to take the following events to write the C # code that will be executed upon their occurrence:

• The Event ValueChanged of numeric entry control numericUpDownAmount:

• The event Load of the form FormConverter
• The event SelectedIndexChanged of the drop-down list for choosing the currency comboBoxCurrency

We will use the following C# code for event handling:

private void FormConverter_Load(object sender, EventArgs e)
{
this.comboBoxCurrency.SelectedItem = "EUR";
}

private void numericUpDownAmount_ValueChanged(object sender, EventArgs e)
{
ConvertCurrency();
}

private void comboBoxCurrency_SelectedIndexChanged(object sender, EventArgs e)
{
ConvertCurrency();
}


Our task is to select the currency "EUR" when we start the program and change the values in the sum or currency field then calculate the result by calling the ConvertCurrency() method.