redirect to another page while mouse right, left click

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C#

ASP.NET

Hi i have one link button in my page.i want to redirect to a new page when mouse left button is clicked(new page should be loaded in same page);
but new page should be loaded in new window when i clicked on "open link in new window" from right button menu.

i have one link button "LinkButton1" and a text box "TextBox1"
my code is:

protected void LinkButton1_Click(object sender, EventArgs e)
    {
        if(TextBox1.Text=="")
        {
            Response.Write("Enter content");
        }
        else
        {
            Response.Redirect("Page2.aspx");
        }

}

That is i want to redirect to a page if the text is not empty.it is working properly in click event.
now i want to execute same code when i clicked mouse right button and selected option "open link in new window" .how can i do it