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The Do...Loop Statement

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A Do...Loop creates an iteration much like a While...End While loop and it offers the additional option of executing the statements in the loop at least one time.


A D V E R T I S E M E N T
Do [While|Until] condition

...statements

Loop

or

Do

...statements

Loop [While|Until] condition


In its Do While...Loop configuration the loop executes as long as a condition test at the beginning of the loop remains True and the condition may be False at the start of the loop, in which case the loop is exited before it begins. Somewhere inside the loop the condition becomes True for exiting the loop as in the case with the While...End While loop, the condition test is for continuing the loop.

In its Do Until...Loop configuration the condition test is for ending of the loop and in otherwords the logic is the same as for the Do While...Loop.

If there is a situation in which the statements in the loop will be executed at least one time, then the Do...While Loop or Do...Until Loop configuration can be used and the condition test is not made until the end of the loop, after that the statements have been executed the first time.

The Do...Loop presents special condition-test options that don't normally appear in routine data processing and for the most part, For...Next and While...End While statements can handle the bulk of processing. As an illustration, though, of the Do...Until Loop option and the following script loads the CodesArray and StatesArray arrays that are used in a previous example of the While...End While loop. To populate the arrays,it reads records from an external text file , then writes the information to this page.

<SCRIPT runat="server">

Dim StatesArray(0) As String
Dim CodesArray(0) As String

Sub Page_Load

Dim FileReader As StreamReader
Dim LineIn As String
Dim FieldArray() As String

FileReader = File.OpenText("e:\WebSite\tutorials\vbnet\vbnet04\StateCodes.txt")
LineIn = FileReader.ReadLine()
Do
FieldArray = Split(LineIn, ",")
StatesArray(UBound(StatesArray)) = FieldArray(0)
CodesArray(UBound(CodesArray)) = FieldArray(1)
LineIn = FileReader.ReadLine()
If LineIn <> ""
ReDim Preserve StatesArray(StatesArray.Length)
ReDim Preserve CodesArray(CodesArray.Length)
End If
Loop Until LineIn = ""
FileReader.Close()

Dim i As Integer
For i = 0 To UBound(StatesArray)
CodesOut.Text &= StatesArray(i) & ", " & CodesArray(i) & "<br/>"
Next

End Sub

</SCRIPT>

<div style="border:solid 1px; padding:10px; width:150px">
<asp:Label id="CodesOut" EnableViewState="False" runat="server"/>
</div>


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Keywords: The Do...Loop Statement in vb.net, while loop statement, for loop statement, select case statement, java statement, value statement, values statement, function statement, nested statement, command statement, case statement, switch statement, count statement, sql statement, condition statement

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