TextReader read data from Pic

Hello guys , im currently newbie in basic4android , and i was given a task to do a apps that can read data from pic and display at label , so i have a problem a little bit , after i connect via bluetooth , apps suddenly become lag and no data display , please help me anyone , btw data that receive already declare as string
here are example of sub that i make it .

Timer1 as Timer
txreg as string
lblsensor as label

Sub Timer1_Tick
If connected Then
txreg= TextReader1.ReadLine
lblsensor.Visible = True
lblsensor.Text = TextReader1.ReadLine
lblsensor.TextColor = Colors.Green
TextReader1.Close
End If

You will need the full version in order to build such an app.