If you want to open new browser window then you can use this code.
<asp:Button ID="ButtonView" OnClick="ButtonView_Click" runat="server" Text="View" Width="80px" />
protected void ButtonView_Click(object sender, EventArgs e)
{
string Fullurl = "newpage.aspx/";
OpenNewBrowserWindow(Fullurl, this);
}
//This is used to open new browser window
public static void OpenNewBrowserWindow(string Url, Control control)
{
ScriptManager.RegisterStartupScript(control, control.GetType(), "Open", "window.open('" + Url + "');", true);
}