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

 

using System;
using System.Collections;
public class SamplesHashtable  {
   public static void Main()  {
      Hashtable myHT = new Hashtable();
      myHT.Add( 0, "zero" );
      myHT.Add( 1, "one" );
      myHT.Add( 2, "two" );
      myHT.Add( 3, "three" );
      myHT.Add( 4, "four" );

      int myKey = 2;
      Console.WriteLine( myHT.ContainsKey( myKey ) );
      myKey = 6;
      Console.WriteLine( myHT.ContainsKey( myKey ) );

      String myValue = "three";
      Console.WriteLine( myHT.ContainsValue( myValue ) );
      myValue = "nine";
      Console.WriteLine( myHT.ContainsValue( myValue ) );
   }
}

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Hashtable.Contains Method determines whether the Hashtable contains a specific key. : Hashtable « Collections Data Structure « C# / C Sharp

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