C#

<br />
public YourInterfaceOrClassType GetClassInstance(string classNameString)<br />
{<br />
    //  Get the actual Type object for the given type.<br />
    System.Type classType = System.Type.GetType(classNameString);<br />
<br />
    //  Throw an exception if the type could not be found.<br />
    if(classType == null)<br />
        throw new TypeLoadException(String.Format("Type {0} does not exist.", classNameString));<br />
<br />
    //  Make sure that the type implements the desired interface.<br />
    Type interfaceType = classType.GetInterface(yourInterfaceNameString, true);<br />
    if(interfaceType == null || !interfaceType.Equals(typeof(YourInterfaceType)))<br />
        throw new TypeLoadException(String.Format("Type {0} does not implement the {1} interface.", classNameString, yourInterfaceNameString));<br />
<br />
    //  Make sure that the type is not an abstract class that cannot be instantiated.<br />
    if(classType.IsAbstract)<br />
        throw new TypeLoadException(String.Format("Type {0} is abstract and cannot be instantiated.", classNameString);<br />
<br />
    //  Create an instance of the type.<br />
    return (YourInterfaceOrClassType)Activator.CreateInstance(classType);<br />
}<br />

peterchen wrote:

Is there an IList implementaiton that fires a change notification when the list is moified (items added, removed, list cleared)?

CPallini wrote:

Perhaps he wants to dynamically create an instance of a class whose type is given by the "frmMainPage" string. Do you agree?