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== Visual Basic Do Until Loops ==
The ''While'' loop causes the loop to continue until an expression ceases to evaluate to ''True''. In other words, as soon as the expression returns ''False'' the loop exists. The ''Until'' keyuword keyword does the reverse, in other words the loop continues until an expression evaluates to ''true''. As long as the expression returns false, the loop continues.
As with the ''While'' loop the ''Until'' expression may be placed at the start or end of the loop:
