48. The methods in the Convert class can be used for explicit and narrowing conversions. True False 49. Keyword Val is used to pass an argument by value. True False 50. Any variables declared in a For...Next statement header have block scope within that statement True False 51. Variables declared in a method exist while the method is active and are destroyed when the method is exited. True False 52. A button will become unavailable only if an error is detected in the event handler for that button. True False 53. A GroupBox is used to group related code. True False 54. The optional Finally blockif present-executes only when an exception occurs in the corresponding Try block. True False 55. Local variables in a Try block cannot be accessed in the corresponding Finally block. True False 56. When an argument is sent ByVal, a copy of the argument's value is sent to the procedure so that the procedure cannot alter the original value. True False 57. A function cannot have multiple arguments. True False 58. It is possible to add values to a list box or combo box during design by using the Items property. True False