Resizing arrays in Visual Basic
ReDim is used to resize arrays in visual basic.
Example
Module Module1
Sub Main()
Dim MyArray(10, 10) As Integer
ReDim MyArray(20, 20)
Console.ReadLine()
End Sub
End Module
In this example, all the contents in the array will be erased when it’s resized. To preserve the contents, you can use the optional Preserve keyword when redimensioning the array. However, if you’re using a multidimensional array you’ll only be able to change the last dimension when using the Preserve keyword or a runtime error will occur.
Module Module1
Sub Main()
Dim MyArray(10, 10) As Integer
ReDim Preserve MyArray(10, 20) ' Allowed, and the contents will remain.
ReDim Preserve MyArray(20, 20) ' Not allowed. A runtime error will occur.
Console.ReadLine()
End Sub
End Module
