Open a Chrome Tab and Close it

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C#

chrome

Tab

Hi!
My Questions is if i clicked button1 google browser is open.
If i clicked button2 i want yahoo browser open and google browser close it.
I dont want to close the whole browser, just the tab I opened.
Hope i can get some solutions or idea from you guys~

private void button1_Click(object sender, EventArgs e)
        {
           Process.Start("http://www.google.com");
        }

private void button2_Click(object sender, EventArgs e)
        {
            Process.Start("http://www.yahoo.com");
        }