Displaying A Chart - Create A Cafeteria Survey Application ?

I have to create a cafeteria survey application. Twenty students were asked to reate, on a scale of 1 to 10, the quality of the food in the student cafeteria, with 1 being "awful" and 10 being "excellent." Allow the user input to be entered using a ComboBox. Use an integer array to store the frequency of each rating. Display the frequencies as a bar chart in a list box.

I can get the comboBox and everthing, but it's not displaying the bar chart.

Here is my code.

Public Class Form1

'String array stores ratings
Dim ratings() As String = {"1-Awful", "2", "3", "4", "5", "6", "7", "8", "9", "10-Excellent"}
Dim studentCount As Integer 'number of student ratings entered
Dim frequency(9) As Integer

[CODE]...............................