private void addValueBtn_Click(object sender, RoutedEventArgs e)
{
string name = addValueNameTextBox.Text.Trim();
string valueAsString = addValueValueTextBox.Text.Trim();
double valueAsDouble = Convert.ToDouble(valueAsString);
NameValuePair nvp = new NameValuePair(name, valueAsDouble);
dataPoints.Add(nvp);
addValueNameTextBox.Text = "";
addValueValueTextBox.Text = "";
}