Difference between hashtable and dictionary

1. HashTable will successfully return null for a non-existent item, whereas the Dictionary will throw an error.
2. Dictionary is faster than a Hashtable because there is no boxing and unboxing.
3. In Dictionary only public static members are thread safe, but all the members in a Hashtable are thread safe.
4. Dictionary is a generic type which means we can use it with any data type.

public void MethodHashTable()
 {
      Hashtable objHashTable = new Hashtable();
      objHashTable.Add(1, 100); // int
      objHashTable.Add(2.99, 200); // float
      objHashTable.Add('A', 300); // char
      objHashTable.Add("4", 400); // string

      lblDisplay1.Text = objHashTable[1].ToString();
      lblDisplay2.Text = objHashTable[2.99].ToString();
      lblDisplay3.Text = objHashTable['A'].ToString();
      lblDisplay4.Text = objHashTable["4"].ToString();
      // ----------- Not Possible for HashTable ----------
      //foreach (KeyValuePair<string, int> pair in objHashTable)
      //{
      // lblDisplay.Text = pair.Value + " " + lblDisplay.Text;
      //}
 }

public void MethodDictionary()
 {
     Dictionary<string, int> dictionary = new Dictionary<string, int>();
     dictionary.Add("cat", 2);
     dictionary.Add("dog", 1);
     dictionary.Add("llama", 0);
     dictionary.Add("iguana", -1);
     //dictionary.Add(1, -2); // Compilation Error

     foreach (KeyValuePair<string, int> pair in dictionary)
     {
          lblDisp.Text = pair.Value + " " + pair.Key;
     }
 }