Hashtable.Clear Method removes all elements from the Hashtable.

 

 using System;
 using System.Collections;
 public class SamplesHashtable  {
    public static void Main()  {
       Hashtable myHT = new Hashtable();
       myHT.Add( "one", "A" );
       myHT.Add( "two", "B" );
       myHT.Add( "three", "C" );
       myHT.Add( "four", "D" );
       myHT.Add( "five", "E" );

       Console.WriteLine( "   Count    : {0}", myHT.Count );
       Console.WriteLine( "   Values:" );
       PrintKeysAndValues( myHT );
       myHT.Clear();
       Console.WriteLine( "After Clear," );
       Console.WriteLine( "   Count    : {0}", myHT.Count );
       Console.WriteLine( "   Values:" );
       PrintKeysAndValues( myHT );
    }
    public static void PrintKeysAndValues( Hashtable myHT )  {
       foreach ( DictionaryEntry de in myHT )
          Console.WriteLine( "\t{0}:\t{1}", de.Key, de.Value );
    }

 }

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Hashtable.Clear Method removes all elements from the Hashtable. : Hashtable « Collections Data Structure « C# / C Sharp

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