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Error resume next vba

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We suggest that you use structured exception handling in your code whenever possible, rather than using unstructured exception handling and the On Error and Resume statements. For more information, see Try Finally Statement. Resume Required. If the error occurred in the same procedure as the error handler, execution resumes with the statement that caused the error.
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"On Error Resume Next" considered harmful

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Resume Statement - Visual Basic | Microsoft Docs

Pearson Software Consulting Services. Error handling refers to the programming practice of anticipating and coding for error conditions that may arise when your program runs. Errors in general come in three flavors: compiler errors such as undeclared variables that prevent your code from compiling; user data entry error such as a user entering a negative value where only a positive number is acceptable; and run time errors, that occur when VBA cannot correctly execute a program statement. We will concern ourselves here only with run time errors. Typical run time errors include attempting to access a non-existent worksheet or workbook, or attempting to divide by zero. The example code in this article will use the division by zero error Error 11 when we want to deliberately raise an error. Your application should make as many checks as possible during initialization to ensure that run time errors do not occur later.
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Resume statement

Below is a simple sub to get user selected range - this is an example from John Walkenbach's book. What I can't understand here is that why in this program, "On error resume next" and "On error goto 0" have to be placed exactly where they are. I tried to place these two statements in different places within the procedure, then I got errors.
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When this statement is executed, any runtime error will be silently trapped and stored in the global Err object. We VB-ers typically use this construct to execute some "non-mission critical" code, where errors can be safely ignored. If this procedure did not contain the On Error Resume Next statement and a runtime error would occur, the application would be terminated with a nasty error message. You do catch runtime errors in every event handling procedure, don't you?
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