Summary
    Gets a flag indicating whether the specified key and
    value are present in the property set.
    
		- Namespace
 - TCLite
.Interfaces  - Containing Type
 - IPropertyBag
 
Syntax
bool Contains(string key, object value)
	Parameters
| Name | Type | Description | 
|---|---|---|
| key | string | The key to be checked | 
| value | object | The value to be checked | 
Return Value
| Type | Description | 
|---|---|
| bool | True if the key and value are present, otherwise false | 
