how to change color based on the condition set for the textbox output in vb.net

what I'm trying to do is to change the color of the text to red when the label's text meet the condition.The font really did change color but if the next output don't meet the requirement,the recent output turn to black like it supposed too but the problem is all the previous output also turn to black. I want to make the previous output maintain the red color instead turn to black. which part of the code did I do wrong?

  If LblMsg.Text = "FAIL:Board Not Found. " Then

        TxtResult3.Text = Session("empID")
        TxtResult3.ForeColor = Drawing.Color.Red

    Else

        TxtResult3.Text = Session("empID")
        TxtResult3.ForeColor = Drawing.Color.Black


    End If