Information.LBound(Array, Int32) Method


Returns the lowest available subscript for the indicated dimension of an array.

public static int LBound (Array Array, int Rank = 1);
static member LBound : Array * int -> int
Public Function LBound (Array As Array, Optional Rank As Integer = 1) As Integer



Required. Array of any data type. The array in which you want to find the lowest possible subscript of a dimension.


Optional. Integer. The dimension for which the lowest possible subscript is to be returned. Use 1 for the first dimension, 2 for the second, and so on. If Rank is omitted, 1 is assumed.



Integer. The lowest value the subscript for the specified dimension can contain. LBound always returns 0 as long as Array has been initialized, even if it has no elements, for example if it is a zero-length string. If Array is Nothing, LBound throws an ArgumentNullException.


Array is Nothing.

Rank less than 1, or Rank is greater than the rank of Array.


The following example uses the LBound function to determine the lowest available subscript for the indicated dimension of an array.

Dim lowest, bigArray(10, 15, 20), littleArray(6) As Integer
lowest = LBound(bigArray, 1)
lowest = LBound(bigArray, 3)
lowest = LBound(littleArray)
' All three calls to LBound return 0.


Since array subscripts start at 0, the lowest available subscript for every dimension is always 0.

For an array with the following dimensions, LBound returns the values in the following table:

Dim a(100, 5, 4) As Byte  
Call to LBound Return value
LBound(a, 1) 0
LBound(a, 2) 0
LBound(a, 3) 0

Applies to

See also