In Visual Basic .NET, you can check if a hash (also known as a dictionary) includes a key using the ContainsKey() method. This method returns a Boolean value indicating whether the hash contains the specified key.
Here's an example:
' Create a new hash
Dim myHash As New Dictionary(Of String, Integer)
' Add some key-value pairs
myHash.Add("apple", 3)
myHash.Add("banana", 2)
myHash.Add("orange", 5)
' Check if the hash includes a key
Dim hasKey As Boolean = myHash.ContainsKey("banana")
If hasKey Then
Console.WriteLine("The hash includes the key 'banana'.")
Else
Console.WriteLine("The hash does not include the key 'banana'.")
End If
In this example, we create a new hash called myHash and add three key-value pairs to it. We then check if myHash includes the key "banana" using the ContainsKey() method. If the hash contains the key, the hasKey variable will be set to True and the message "The hash includes the key 'banana'." will be printed to the console. If the hash does not contain the key, the hasKey variable will be set to False and the message "The hash does not include the key 'banana'." will be printed to the console.