private void btnConvert_Click(object sender, EventArgs e)
{
double valueFromTextBox;
try
{
if (String.IsNullOrEmpty(textBoxValue.Text))
{
throw new Exception("Field cannot be empty!");
}
labelError.Text = "";
Double.TryParse(textBoxValue.Text, out valueFromTextBox);
_lengthConverter.SetLength(Double.Parse(textBoxValue.Text));
if (comboBoxConvertFrom.SelectedItem == null || comboBoxConvertTo.SelectedItem == null)
{
throw new ArgumentNullException(null, "Pick a unit!");
}
labelResult.Text = Math.Round(
_lengthConverter.HandleConverter(
comboBoxConvertFrom.SelectedItem.ToString(), comboBoxConvertTo.SelectedItem.ToString()), 2).ToString();
}
catch (ArgumentNullException ex)
{
labelError.Text = ex.Message;
}
catch (Exception ex)
{
labelError.Text = ex.Message;
}
}