How to find masterpage control in content page and fierd its event

protected void Page_Load(object sender, EventArgs e)
    {
        Button bt = (Button)Master.FindControl("Button1");  
        bt.Click+=new EventHandler(bt_Click);
    }
    protected void bt_Click(object sender, EventArgs e)
    {
        TextBox1.Text = "Sanjay kumar acharya";
    }