Blink Panel when BackColor is red using C# and VB.Net in Windows Application

Hi anirudhp,

You can't display blinking on same panel.

For this you need to add another panel where you will display the blinking effect.

Refer below code.

I have added two panels in the form.

C#

private void Form1_Load(object sender, EventArgs e)
    {
        panel1.BackColor = Color.Red;
        System.Windows.Forms.Timer timer1 = new System.Windows.Forms.Timer();
        if (panel1.BackColor == Color.Red)
        {
            timer1.Start();
            System.Threading.Thread thread = new System.Threading.Thread(Blink);
            thread.Start();
        }
    }
    int count = 10;

    private void Blink(object o)
    {
        bool go = false;
        while (count > 0)
        {
            while (!go)
            {
                panel2.BackColor = Color.Red;
                go = true;
                System.Threading.Thread.Sleep(500);
            }

            while (go)
            {
                panel2.BackColor = Color.Green;
                go = false;
                System.Threading.Thread.Sleep(500);
            }
        }
    }
}

VB.Net

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
    panel1.BackColor = Color.Red
    Dim timer1 As System.Windows.Forms.Timer = New System.Windows.Forms.Timer()

    If panel1.BackColor = Color.Red Then
        timer1.Start()
        Dim thread As System.Threading.Thread = New System.Threading.Thread(AddressOf Blink)
        thread.Start()
    End If
End Sub

Private count As Integer = 10

Private Sub Blink(ByVal o As Object)
    Dim go As Boolean = False

    While count > 0

        While Not go
            panel2.BackColor = Color.Red
            go = True
            System.Threading.Thread.Sleep(500)
        End While

        While go
            panel2.BackColor = Color.Green
            go = False
            System.Threading.Thread.Sleep(500)
        End While
    End While
End Sub

Screenshot