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Visual Basic Interview Questions & Answers

Visual Basic Technical Interview Questions

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How do ByVal and ByRef behave when a VB.NET parameter refers to an object?

ByVal copies the argument value into the parameter. For a reference type, that value is a reference, so the method can still mutate the same object, but reassigning the parameter does not replace the ...

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Why should VB.NET file handling use a Using block?

A Using block ensures that a disposable resource is disposed when control leaves the block, including when an exception occurs. This makes file handles available for other operations and avoids cleanu...

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How would you validate integer input without using exceptions for an expected invalid value?

Use Integer.TryParse to attempt conversion and check its Boolean result before using the output. Invalid text and values outside the Integer range return False instead of requiring an exception-driven...

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A VB.NET desktop application freezes while waiting for a web request. How would you redesign it?

Use a genuinely asynchronous I/O API and Await it from an asynchronous event handler so the UI message loop can continue processing input. Keep longer CPU-bound work off the UI thread where appropriat...

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