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namespace Euro_Dollar_Umrechner
{
public partial class Form1 : Form
{
Double kurs;
Double euro;
Double dollar;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
if (textBox1.Text == String.Empty)
MessageBox.Show("Bitte geben Sie einen Umrechnungskurs ein.", "Fehler");
if (!(Double.TryParse(textBox1.Text, out kurs)))
MessageBox.Show("Sie haben keine Zahl eingegeben.", "Fehler");
if (textBox2.Text != String.Empty)
{
euro = Convert.ToDouble(textBox3.Text);
euro = (dollar/kurs);
}
else if (textBox3.Text != String.Empty)
{
dollar = Convert.ToDouble(textBox2.Text);
dollar = (euro * kurs);
}
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
kurs = Convert.ToDouble(textBox1.Text);
}
private void textBox2_TextChanged(object sender, EventArgs e)
{
textBox3.Text = String.Empty;
}
private void textBox3_TextChanged(object sender, EventArgs e)
{
textBox2.Text = String.Empty;
}
}
}
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