Please refer below article

ASP.Net Response.Redirect or Server.Transfer: Open New Tab from Code Behind

I hope this will help you out.

Please refer below code.

HTML

<div>
    <asp:Button ID="Button1" Text="New Tab" runat="server" OnClick="NewTab" />&nbsp;&nbsp;&nbsp;
    <asp:Button ID="Button2" Text="New Window" runat="server" OnClick="NewWindow" />
</div>

C#

protected void NewTab(object sender, EventArgs e)
{

    string billredirectUrl = "https://drive.google.com/open?id=" + ("12345".Trim());
    StringBuilder sb = new StringBuilder();
    sb.Append("<script type = 'text/javascript'>");
    sb.Append("window.open('");
    sb.Append(billredirectUrl);
    sb.Append("');");
    sb.Append("</script>");
    ClientScript.RegisterStartupScript(this.GetType(), "script", sb.ToString());
}

protected void NewWindow(object sender, EventArgs e)
{
    string billredirectUrl = "https://drive.google.com/open?id=" + ("12345".Trim());
    ScriptManager.RegisterStartupScript(this, typeof(string), "OPEN_WINDOW", (Convert.ToString("window.open('") + billredirectUrl) + "','_blank',CONFIG='HEIGHT=650,WIDTH=800,TOOLBAR=no,MENUBAR=no,SCROLLBARS=no,RESIZABLE=no,LOCATION=no,DIRECTORIES=no,STATUS=no');", true);
}

VB

Protected Sub NewTab(sender As Object, e As EventArgs)

	Dim billredirectUrl As String = "https://drive.google.com/open?id=" + ("12345".Trim())
	Dim sb As New StringBuilder()
	sb.Append("<script type = 'text/javascript'>")
	sb.Append("window.open('")
	sb.Append(billredirectUrl)
	sb.Append("');")
	sb.Append("</script>")
	ClientScript.RegisterStartupScript(Me.[GetType](), "script", sb.ToString())
End Sub

Protected Sub NewWindow(sender As Object, e As EventArgs)
	Dim billredirectUrl As String = "https://drive.google.com/open?id=" + ("12345".Trim())
	ScriptManager.RegisterStartupScript(Me, GetType(String), "OPEN_WINDOW", (Convert.ToString("window.open('") & billredirectUrl) + "','_blank',CONFIG='HEIGHT=650,WIDTH=800,TOOLBAR=no,MENUBAR=no,SCROLLBARS=no,RESIZABLE=no,LOCATION=no,DIRECTORIES=no,STATUS=no');", True)
End Sub

Screenshot

Thanks for suggestion

following is the my code

 HTML code

<asp:LinkButton runat="server" Visible="true" ID="btnOpenLink" Text="Open in New Tab" OnClientClick="SetTarget();">
<i class="icomoon-export2"></i> Export To Google Sheet
 </asp:LinkButton>

 Javascript

<script type="text/javascript">
function SetTarget() {
document.forms[0].target = "_blank";
}

 on btnopenlink click event

                Response.Redirect("https://drive.google.com/open?id=" + file.Id)

 and i m able to open the link in new tab

for more information please check the below link

http://www.aspsnippets.com/Articles/ASPNet-ResponseRedirect-or-ServerTransfer-Open-New-Tab-from-Code-Behind.aspx