Why does the Arduino delay receiving data from Visual Basic.NET? - vb.net

Question

This is the Arduino code for the receiver
void loop() {
int dir = Serial.read();
if (dir == 'A') {
Motors();
}
if (dir == 'B') {
Zero();
}
}
and this Visual Basic.NET Code
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
If Button1.Enabled = True Then
SerialPort1.Open()
SerialPort1.Write("A")
SerialPort1.Write(txtAngle1Mr.Text + Chr(13))
SerialPort1.Close()
End If
End Sub
okay when I click on the button , my program write "A" ON SERIAL
And if write "A" ON SERIAL
Arduino Will Run "Motors" Function
Arduino is Delaying to receive data from Visual Basic.NET and run "Motors" Function
Arduino runs "Motors" Function. but he's Delaying
why Arduino is Delaying ?
and how can I solve this ?

Answer 1

I solved problem
In VisualBasic.NET I was sending one value by just 1 code.
SerialPort1.Write(TextBox1.Text + Chr(13))
and in Arduino I was receving the data by just one code
int example 1 = Serial.parseInt();
the problem is
in arduino I was receving more than value and I just send one value!
I was receiving data that I did not send!
in VisualBasic I wrote this
SerialPort1.Write(TextBox1.Text + Chr(13))
in Arduino I wrote this
int example1 = Serial.parseInt();
int example2 = Serial.parseInt();
int example3 = Serial.parseInt();
int example4 = Serial.parseInt();
look. I was sending one value and the arduino was trying to receive more than one value
This is why the Arduino was late in receiving data
I hope you understand me
Thank you all