Comments by maul59 (Top 2 by date)

Thanks. I actually just got it,
it was if (double.TryParse(DailyTextbox.Text, out growth))
//Make SecondListbox calculate as percentage
growth = growth / 100;

I have a new problem however (not major, I can submit this as is for almost full marks). My problem is this I want to make error messages for invalid entries, and I got it to work on the second textbox (dailytextbox) but not the first (OrganismTextbox). But I entered the code exactly the same.

//Assign Variables
if (double.TryParse(OrganismsTextbox.Text, out organisms))
else
{
MessageBox.Show("Invalid Input for Organisms".);
}
{
if (double.TryParse(DailyTextbox.Text, out growth))
//Make SecondListbox calculate as percentage
growth = growth / 100;
else
{
MessageBox.Show("Invalid Input for Daily Increase.");
}
{