About a jagged array.

Imports System
Imports System.Data
Imports System.Collections

public class MainClass
   Shared Sub Main()
        Dim c()() As Integer = {New Integer() {1, 2}, New Integer() {1, 2, 3}}

        c(1) = New Integer() {4, 5}
        Console.WriteLine(c(1)(1))
        c(1) = System.Array.CreateInstance(GetType(System.Int32), 10)
        Console.WriteLine(c(1)(1))
        Dim d() As Integer = {6, 7}
        c(1) = d
        Console.WriteLine(c(1)(1))
   End Sub
End Class