If used, the Option Explicit statement must appear in a script before any other statements.

When you use the Option Explicit statement, you must explicitly declare all variables using the Dim, Private, Public, or ReDim statements. If you attempt to use an undeclared variable name, an error occurs.

Tip
Use Option Explicit to avoid incorrectly typing the name of an existing variable or to avoid confusion in code where the scope of the variable is not clear.

The following example illustrates use of the Option Explicit statement.

	Copy Code
Option Explicit ' Force explicit variable declaration. Dim MyVar ' Declare variable. MyInt = 10 ' Undeclared variable generates error. MyVar = 10 ' Declared variable does not generate error.

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