C# .NET - RegisterStartupScript for window.open getting new window instead of new tab only in chrome

Haii.....


       I am using RegisterStartupScript for displaying new tab in browser.Its working fine with Firefox but when comes to Google chrome the page is getting opening in new window.The code is pasted bellow ..Please give your suggessions.




    ClientScript.RegisterStartupScript(GetType(), "openwindow", "<script type=text/javascript> window.open('frmTable26To37.aspx?ddlValue=" + ddlvalue + "&TableNo=" + strTableNo + "'); </script>");



I was also tried with 


string redirect = "<script>window.open('frmTable26To37.aspx?ddlValue=" + ddlvalue + "&TableNo=" + strTableNo + "','_blank');</script>";
            Response.Write(redirect);



It is also giving same result.

Thanks in advance..