The ReDim statement is used to resize the existing array by defining the subscript (3). Yes right the static array is created at the compile time where as the dynamic array is created on the run time. Dynamic arrays are arrays that can be dimensioned and re-dimensioned as par the need of the program. In this case, we need to use dynamic array where the number of elements will be decided during run time. If you use ReDim to change the size of an array and want to preserve the contents of the array at the same time, be sure to include the Preserve argument to the ReDim statement: The following procedure uses a dynamic array, varray, to hold cash flow values entered by the user: Sub main   Dim aprate as Single   Dim varray() as Double   Dim cflowper as Integer   Dim msgtext as String   Dim x as Integer   Dim netpv as Double   cflowper=2   ReDim varray(cflowper)   For x= 1 to cflowper   varray(x)=500   Next x   aprate=10   If aprate>1 then      aprate=aprate/100   End If   netpv=NPV(aprate,varray())   msgtext="The net present value is: "   msgtext=msgtext & Format(netpv, "Currency")   TheApplication.raiseErrorText msgtextEnd Sub. © Copyright 2011-2018 www.javatpoint.com. As the name suggests, dynamic arrays are those arrays which can be dimensioned as well as re0dimensiones as required. 9. Let us create a program to understand how we can add new elements to a dynamic array. This means that you can add new elements to the array any time we want. In computer science, a dynamic array, growable array, resizable array, dynamic table, mutable array, or array list is a random access, variable-size list data structure that allows elements to be added or removed. The array size can grow at any time. In this VB.NET tutorial, I'll show you the basics of using Dynamic Arrays with ReDim. You can declare a dynamic array using the ReDimstatement. A subscript represents the new dimension of the array. Mail us on hr@javatpoint.com, to get more information about given services. Memory to contain the array data must be allocated from dynamic memory using statements such as the one below: Arrays are static in that they don't grow or shrink as you add/remove items from them. Software related issues. Instead, the subscript range is set using the ReDim statement. An array that uses more than one index or subscript is called multidimensional. I wanna declare a string array without specifying the size of string array in vb.net. It is used to store multiple values for the user the only condition is that the data type of those values remains the same as of the data type of the array. By contrast, an array declared without the number of elements, as in Dim Names(), is a dynamic array, and its number of elements can be changed using ReDim. LBound determines the lower bounds of an array, UBound the upper bound. To resolve this problem, we use the dynamic array. Sometimes you may not know how large to make an array. Dynamic Array Dynamic Arrays are arrays that can change sizes (as opposed to static arrays, which are static). Hence, an array can store an integer, string, or characters in a single array variable. once a jagged array has been dimensioned thus: Dim Jaggy()() as string. Dynamic arrays differ from fixed arrays because a subscript range for the array elements is not specified when the array is dimensioned. To resize an array, we have used a Preserve keyword that preserve the existing item in the array. The ReDim statement is used to declare a dynamic array. A practical application for 2-dimensional arrays would be to use themto store the available seats in a cinema. With these functions you can iterate through an array with a dynamic size and you don't need to keep track of the array's size. 2. arraynameis the name of the array to re-dimension. Local arrays are declared in a procedure using Dim or Static.