Visual Basic loop structures allow you to run one or more lines of code repetitively. You can repeat the statements in a loop structure until a condition is
True, until a condition is
False, a specified number of times, or once for each element in a collection.
The following illustration shows a loop structure that runs a set of statements until a condition becomes true.
Running a set of statements until a condition becomes true
End While construction runs a set of statements as long as the condition specified in the
While statement is
True. For more information, see While...End While Statement.
Loop construction allows you to test a condition at either the beginning or the end of a loop structure. You can also specify whether to repeat the loop while the condition remains
True or until it becomes
True. For more information, see Do...Loop Statement.
Next construction performs the loop a set number of times. It uses a loop control variable, also called a counter, to keep track of the repetitions. You specify the starting and ending values for this counter, and you can optionally specify the amount by which it increases from one repetition to the next. For more information, see For...Next Statement.
For Each Loops
Next construction runs a set of statements once for each element in a collection. You specify the loop control variable, but you do not have to determine starting or ending values for it. For more information, see For Each...Next Statement.