windows calculator application

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C#

i want to create a windows application in c# which open the windows calculator and also i close that calculator using the same win.application.finaly i want to read the content of windows calc text box and paste that in text box present in my application when i use close button in my win application.

so far i use the below code in button click event to open and close the windows calc but i am unable to read the text of windows calci text box

my code:
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private void button1_Click(object sender, EventArgs e)
{
    p = Process.Start("calc");
}

private void button2_Click(object sender, EventArgs e)
{
    p.Kill();
}

this will open and close the windows calc.please help meee...

Thanks in advance....