Time Validation using Timer Control in c#

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.NET2.0

.NET3.5

C#

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I am working on Windows Application.
In a form I dragged one label and one timer control.
I have written the following code:-

On form load event:-

Timer1.Start(); // Timer in initialized.

private void timer1_Tick(object sender, EventArgs e)
        {
            bool status = false;
            label1.Text = DateTime.Now.ToLongTimeString();
            DateTime time = Convert.ToDateTime("10:05:00 PM");
            if (DateTime.Now.ToLongTimeString() == time.ToLongTimeString())
            {
                MessageBox.Show("Perfect Code.", "Timer Control", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }

I was running program at 10 pm so I entered 10 pm. Enter the timing after the current time.

Error in this program is that when the user time is equal to system time Message Box is shown 9 times. Help me sort out this.

Thanks in Advance....