How to open asp:HyperLink.NavigationUrl in a new tab
<asp:HyperLink ID="lnkCompUrl" runat="server" Width="200px"></asp:HyperLink></li>lnkCompUrl.Text = Convert.ToString(dsData.Tables[0].Rows[0]["comp_url"]);string url="http://"+Convert.ToString(dsData.Tables[0].Rows[0]["comp_url"]);lnkCompUrl.NavigateUrl = String.Format("javascript:void(window.open('"+url+"','_blank'));");