I am trying to take the values in the textboxes, named sequentially from 0-9, and add that to a List using a for loop. I am having problems with the syntax or something.
I suppose that your textbox are named "amtBox" + a number. (The Name property is "amtBox1" as an example)
In this case you could use
Control[] t = Controls.Find("amtBox" + i, false);
for a code like this
for (int i = 0; i <= amt.Count(); i++)
{
Control[] t = Controls.Find("amtBox" + i, false);
if(t != null && t.Length > 0)
{
amt[i] = int.Parse(t[0].Text);
}
}