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VB.Net - Do Loop
It repeats the enclosed block of statements while a Boolean condition is True or until the condition becomes True. It could be terminated at any time with the Exit Do statement.
The syntax for this loop construct is −
Do { While | Until } condition [ statements ] [ Continue Do ] [ statements ] [ Exit Do ] [ statements ] Loop -or- Do [ statements ] [ Continue Do ] [ statements ] [ Exit Do ] [ statements ] Loop { While | Until } condition
Flow Diagram
Example
Module loops Sub Main() ' local variable definition Dim a As Integer = 10 'do loop execution Do Console.WriteLine("value of a: {0}", a) a = a + 1 Loop While (a < 20) Console.ReadLine() End Sub End Module
When the above code is compiled and executed, it produces the following result −
value of a: 10 value of a: 11 value of a: 12 value of a: 13 value of a: 14 value of a: 15 value of a: 16 value of a: 17 value of a: 18 value of a: 19
The program would behave in same way, if you use an Until statement, instead of While −
Module loops Sub Main() ' local variable definition Dim a As Integer = 10 'do loop execution Do Console.WriteLine("value of a: {0}", a) a = a + 1 Loop Until (a = 20) Console.ReadLine() End Sub End Module
When the above code is compiled and executed, it produces the following result −
value of a: 10 value of a: 11 value of a: 12 value of a: 13 value of a: 14 value of a: 15 value of a: 16 value of a: 17 value of a: 18 value of a: 19
vb.net_loops.htm
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