1. Windows Database Applications CIS 341 Chapter 11

2. Objectives Declare and reference collections Collection types Data Structures Object collection Items collection of a list box

3. Referencing Collection Items DsStoreSales1.Tables(“Stores”) DsStoreSales1.Tables(0)

4. Collection Class ArrayListContains, Insert, RemoveAt, and Sort BitArrayBoolean values CollectionBaseUsed for inheritance DictionaryBaseUsed for inheritance HashtableAdd, Remove QueueEnqueue, Dequeue, Peek SortedListAdd, Remove, and RemoveAt StackPush, Pop, Peek

5. Stacks mstkList.Push(strItem) strItem = mstkList.Peek() mstkList.Pop()

6. Queue mqueList.Enqueue(strItem) strItem = mqueList.Peek() mqueList.Dequeue()

7. Hash Tables Strkey = strItem.GetHashCode.ToString() mhshTable.Add(strKey, strItem) strItem = lstLanguages.SelectedItem.ToString() strKey = strItem.GetHashCode mhshTable.Remove(strKey) For Each strItem In mhshTable.Values lstLanguages.Items.Add(strItem) Next

8. Sorted List strKey = strItem.Substring(0,3) msrtList.Add(strKey, strItem) lstLanguages.Items.Clear() For each strItem in msrtList.Values lstLanguages.Items.Add(strItem) Next

9. Collection of Objects Dim objStudent As New Student(txtName.Text, CDec(txtGPA.Text)) mcolStudents.Add(strKey, objStudent) objStudent = CType(mcolStudents.Item(strKey), Student)