Hashtable.Remove Method removes the element with the specified key from the Hashtable.

 

using System;
using System.Collections;
public class SamplesHashtable  {
   public static void Main()  {
      Hashtable myHT = new Hashtable();
      myHT.Add( "1a", "The" );
      myHT.Add( "1b", "quick" );
      myHT.Add( "1c", "brown" );

      PrintKeysAndValues( myHT );
      myHT.Remove( "1b" );
      PrintKeysAndValues( myHT );
   }
   public static void PrintKeysAndValues( Hashtable myHT )  {
      foreach ( DictionaryEntry de in myHT )
         Console.WriteLine( "    {0}:    {1}", de.Key, de.Value );
      Console.WriteLine();
   }

}

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Hashtable.Remove Method removes the element with the specified key from the Hashtable. : Hashtable « Collections Data Structure « C# / C Sharp

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