Measure how to use .NET and API functions in a rapid development platform

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When writing code on the platform, we can call .NET functions, but we need to be careful to refer to the full name.

For example:

'determine whether the file exists

System.IO.File.Exists ("D:.txt")

'read the contents of the file

Dim str=System.IO.File.ReadAllText ("D:.txt", System.Text.Encoding.UTF8)

'delete the file

System.IO.File.Delete ("D:.txt")

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