https://en.wikipedia.org/wiki/Short-circuit_evaluation[Short-circuit evaluation] is an evaluation strategy for https://en.wikipedia.org/wiki/Logical_connective[Boolean operators], that doesn't evaluate the second argument of the operator if it is not needed to determine the result of the operation.
VB.NET provides logical operators that implement short-circuiting evaluations `AndAlso` and `OrElse`, as well as the non-short-circuiting versions `And` and `Or`. Unlike short-circuiting operators, the non-short-circuiting operators evaluate both operands and afterward perform the logical operation.
For example `False AndAlso FunctionCall` always results in `False` even when the `FunctionCall` invocation would raise an exception. In contrast, `False And FunctionCall` also evaluates `FunctionCall`, and results in an exception if `FunctionCall` raises an exception.
The use of non-short-circuit logic in a boolean context is likely a mistake, one that could cause serious program errors as conditions are evaluated under the wrong circumstances.
* https://learn.microsoft.com/en-us/dotnet/visual-basic/programming-guide/language-features/operators-and-expressions/logical-and-bitwise-operators[Logical and Bitwise Operators in Visual Basic]
