Having a dropdown list when calling a function

[Simon Canning]

Here is an example function that I am referring to:

    Public Function testFunction(stringTestString As String, stringChoose As String = {"Example 1", "Example 2"}) As Boolean
        'Do code
    End Function

When I use this function in code, when I select the parameter for stringChoose, I would like a dropdown list to appear that lets me choose either "Example 1" or "Example 2"

How do I do this?

[jmcilhinney]

You don't do that with Strings. What you want is an enumeration.

Public Enum Example
    Example1
    Example2
End Enum

Your method could then look like this:

Public Function TestFunction(stringTestString As String, eg As Example) As Boolean
    Select Case eg
        Case Example.Example1
            Return True
        Case Example.Example2
            Return False
    End Select
End Function

You probably used various enumerations already, e.g. MessageBoxButtons or DialogResult. The idea is that the system uses numbers under the hood for efficiency but the developer uses identifiers in code for simplicity. The Integer values are implicitly assigned sequentially from zero or you can assign them explicitly if you want something different. If you were to just use raw Integer values then they would be meaningless in code unless you had prior knowledge, but Strings would be very inefficient when being used under the hood. Unlike both Integers and Strings, enumerations also let you limit the possible values to a small set. One thing to note is that, just like all identifiers, enumerations values must not contains spaces or other special characters and must start with either a letter or an underscore. If you want to be able to display a more user-friendly in your UI then you might like to follow the CodeBank link in my signature and check out my thread on just that subject.