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Instead of adding several almost equal lines in a script we can use loops to perform a task like this. In JavaScript there are two different kind of loops: for - loops through a block of code a specified number of times. while - loops through a block of code while a specified condition is true.
When Visual Basic executes this Do loop, it first tests condition. If condition is False (zero), it skips past all the statements. If it's True (nonzero), Visual Basic executes the statements and then goes back to the Do While statement and tests the condition again. Consequently, the loop can execute any number of times, as long as condition is nonzero or True. The statements never execute if condition is initially False.