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This is the latest information letting you know,  Dimensioning Variables .

When dimensioning variables , there is one pitfall that must be watched out . If a variable is not explicitly declared in the program, Visual basic will implicitly declare it and the application developer will never realize it . The same thing will happen if a variable is misspelled, however, the program might not work correctly because there is now an extra variable being used. to prevent this from happening, the option explicit statement should be used in the declaration section of each form .

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