That's not a number, you doofus!

MP1/TipTaxTotal_CalebFontenot/Form1.cs

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+using System.Linq.Expressions;
+
+namespace TipTaxTotal_CalebFontenot
+{
+    public partial class TipTaxTotal : Form
+    {
+        public TipTaxTotal()
+        {
+            InitializeComponent();
+        }
+
+        private void calculateButton_Click(object sender, EventArgs e)
+        {
+            // Setup Vars
+            double tip;
+            double salesTax;
+            double subTotal;
+            double total;
+            double salesTaxAmount;
+            double tipAmount;
+
+            try
+            {
+
+                // Get data
+                tip = double.Parse(tipTextBox.Text);
+                salesTax = double.Parse(salesTaxTextBox.Text);
+                subTotal = double.Parse(subTotalTextbox.Text);
+
+                // Calculate
+                // Check if tip is a decimal. If it isn't, turn it into one.
+                if (tip > .99)
+                {
+                    while (tip > 1)
+                    {
+                        tip = tip / 10;
+                    }
+                }
+                if (salesTax > .99)
+                {
+                    while (salesTax > 1)
+                    {
+                        salesTax = salesTax / 10;
+                    }
+                }
+
+                tipAmount = subTotal * tip;
+                salesTaxAmount = subTotal * salesTax;
+                total = subTotal + (tipAmount + salesTaxAmount);
+
+                //Output
+
+                outputLabel.Text = "Your total is $" + total;
+                salesTaxTextBox.Text = salesTax.ToString();
+                tipTextBox.Text = tip.ToString();
+
+            }
+            catch
+            {
+                MessageBox.Show("That's not a number, you doofus!");
+            }
+
+           
+        }
+    }
+}