Adds an element to the collection using the specified key and value .
Namespace:  System.Web.Mvc
Assembly:  System.Web.Mvc (in System.Web.Mvc.dll)
Syntax
'Declaration
Public Sub Add ( _
    key As String, _
    value As Object _
)
public void Add(
    string key,
    Object value
)
public:
virtual void Add(
    String^ key, 
    Object^ value
) sealed
Parameters
- key
 Type: System.String
 The key of the element to add.
- value
 Type: System.Object
 The value of the element to add.
Implements
IDictionary<TKey, TValue>.Add(TKey, TValue)
Exceptions
| Exception | Condition | 
|---|---|
| NotSupportedException | The IDictionary<TKey, TValue> object is read-only. | 
| ArgumentNullException | key is null. | 
| ArgumentException | An element with the same key already exists in the IDictionary<TKey, TValue> object. |