（程序阅读）
Public Class Form1
Private Sub Form1_Resize(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Resize
Dim x As Integer = Size.Width()
Dim y As Integer = Size.Height()
Label1.Text = "窗体的大小为（" & Str(x) & " , " & Str(y) & "）"
End Sub
End Class
(1)类Form1中的Form1_Resize过程实现的是一个什么功能？
(2)函数str是实现什么功能？
Public Class Form1
Private count As Integer = 1
Private Sub NewToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NewToolStripMenuItem.Click
Dim frm As New Child()
frm.Text = "MDI子窗体" & Str(count) ' 设置窗体的标题
count += 1
frm.MdiParent = Me
frm.Activate()
frm.Show()
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
MenuStrip1.MdiWindowListItem = WindowsToolStripMenuItem
End Sub
End Class
(3)写出语句Dim frm As New Child()的作用 (4)写出语句frm.MdiParent = Me的作用。 (5) MenuStrip1.MdiWindowListItem = WindowsToolStripMenuItem语句的作用。
在ADO.NET中，表示一个内存内关系数据的表类是( )
A.DataTable B. DataRow C. DataTableCollection D DataColumn
