Hashtable.Contains Method Determines whether the Hashtable contains a specific key.

 

Imports System
Imports System.Collections

Public Class SamplesHashtable
    Public Shared Sub Main()
        Dim myHT As New Hashtable()
        myHT.Add(0, "zero")
        myHT.Add(1, "one")
        myHT.Add(2, "two")
        myHT.Add(3, "three")
        myHT.Add(4, "four")

        PrintIndexAndKeysAndValues(myHT)

        Dim myKey As Integer = 2
        Console.Write("The key ""{0}"" is ", myKey)
        If(myHT.ContainsKey(myKey))
           Console.WriteLine("in the Hashtable.")
        Else
           Console.WriteLine("NOT in the Hashtable.")
        End If

        Dim myValue As String = "three"
        Console.Write("The value ""{0}"" is ", myValue)
        If(myHT.ContainsValue(myValue))
           Console.WriteLine(" in the Hashtable.")
        Else
           Console.WriteLine(" NOT in the Hashtable.")
        End If
    End Sub
    Public Shared Sub PrintIndexAndKeysAndValues(myHT As Hashtable)
        Dim i As Integer = 0
        Dim de As DictionaryEntry
        For Each de In  myHT
            Console.WriteLine("{1}:{2}", i, de.Key, de.Value)
            i = i + 1
        Next de
        Console.WriteLine()
    End Sub 

End Class

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8.	Hashtable.Add Method adds an element with the specified key and value into the Hashtable.
9.	Hashtable.Clear Method removes all elements from the Hashtable.
10.	Hashtable.CopyTo Method copies the Hashtable elements to a one-dimensional Array instance at the specified index.
11.	Hashtable.GetEnumerator Method returns an IDictionaryEnumerator that iterates through the Hashtable.
12.	Displays the keys and values of the Hashtable using foreach statement
13.	Hashtable.IsSynchronized Property gets a value indicating whether access to the Hashtable is synchronized (thread safe).
14.	Hashtable.Remove Method removes the element with the specified key from the Hashtable.

Hashtable.Contains Method Determines whether the Hashtable contains a specific key. : HashTable « Data Structure « VB.Net

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