Can this piece of VB.NET cause a memory increase / memory leak?

Question

I'm facing a memory increase, looking like a memory leak, in a VB.NET process (see my latest other questions).

Now I've seen that the memory usage increases every time this piece of code is executed. I've subscribed to SonarCube in order to help investigation, but I don't have the license yet, so I need to check this manually (but I don't know VB.NET that well, and as far as I can judge, .NET takes care of the memory management, so there shouldn't be any memory leak possible).

Hereby my source code:

Private Sub ExecuteTask(ByVal task As Task)
    Dim taskToExecute As Tasks.ITask = ...(task.TaskName) 
        ' taskToExecute gets retrieved from a dictionary
    Try
        If taskToExecute Is Nothing Then
            Throw New Exception("No task found with name :" + task.TaskName)
        End If

        If taskToExecute.Execute() = True Then
            RaiseEvent TaskExecuted(taskToExecute)
        End If
    Catch ex As Exception
        RaiseEvent TaskFailed(taskToExecute)
    End Try
End Sub

(As far as I can judge from the logs, the task execution is successful.)

Thanks in advance (or is this a question for the Code Review site?)