Catch (Visual Basic)
Introduces a statement block to be run if a particular exception occurs inside a Try block.
Remarks
Each Try structure must include either a Finally block or at least one Catch block.
When to Use Catch
If you anticipate that a particular exception might occur during a particular section of code, put the code in a Try block and use a Catch block to retain control and handle the exception if it occurs. You can use as many different Catch blocks as necessary within a Try structure.
The Catch keyword can be used in this context:
Try...Catch...Finally Statement (Visual Basic)