Which Button was submit the form in page load event

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The sender argument to the handler contains a reference to the control which raised the event. 

private void Button1_Click(object sender, EventArgs e)
{
    Button theButton = (Button)sender;
    ...
}
In the Load event: Use Request's Form collection will contain a key/value for the submitting button, but not for the others. So you can do something like 

protected void Page_Load(object sender, EventArgs e)
{
    Button theButton = null;
    if (Request.Form.AllKeys.Contains("button1"))
        theButton = button1;
    else if (Request.Form.AllKeys.Contains("button2"))
        theButton = button2;
    ...
}

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