Public Function BeginProcessRequest( _
   ByVal context As HttpContext, _
   ByVal cb As AsyncCallback, _
   ByVal extraData As Object _
) As IAsyncResult

Dim instance As ChartImageHttpHandler
Dim context As HttpContext
Dim cb As AsyncCallback
Dim extraData As Object
Dim value As IAsyncResult
 
value = instance.BeginProcessRequest(context, cb, extraData)

public IAsyncResult BeginProcessRequest( 
   HttpContext context,
   AsyncCallback cb,
   object extraData
)