Changing ASP.Net label's text with VB.Net

I currently have a form that has a label appear when there is an error with changing your password.

Currently there is a bug that makes a message pop up even when the change is successful that says, "Object reference not set to an instance of an object."

I'm wanting to write a test that says when the label is equal to that message to make the visibility false. I've tried:

If lblMsg.Text = "Object reference not set to an instance of an object." Then
            lblMsg.Visible = False
        End If

This, among other variations, have yet to work successfully for me.

Any idea on what other ways I can write this out to hide the label when that message occurs?

via Chebli Mohamed