How do I add hyperlink to excel at the time of exporting from gridview in ASP.NET?

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ASP.NET

C#3.5

MS-Excel

Gridview

Hello,Everyone
I am working on web application .I have Exported gridview data in excel .but now i want add hyperlink to excel file before exporting.i.e when i get excel file the i should have hyperlink in excel and when user hit this link then directories open automatically.

What I have tried:

Response.Clear();
           Response.AddHeader("content-disposition", "attachment;filename=ExportData1.xls");
           Response.Charset = "";
           Response.ContentType = "application/vnd.xls";
           StringWriter StringWriter = new System.IO.StringWriter();
           HtmlTextWriter HtmlTextWriter = new HtmlTextWriter(StringWriter);

             gvDetails.RenderControl(HtmlTextWriter);

           Response.Write(StringWriter.ToString());
           Response.End();

the above code for export gridview data to excel.
I.e gridviews have id,filename,contenttype,and data type as columns.
I have to export all these field except data and additionaly add hyperlink to hit the file location on excel file.
the excel will be look like as...

Id	 FileName	          FileType	  DownLoad
56	Sujata_PDF.pdf	        application/PDF	Download
57	irctcticket.pdf	        application/PDF	Download
46	PBILLJG0050715-16.pdf	application/PDF	Download
47	PBILLJG0051215-16.pdf	application/PDF	Download
48	PBILLJG0051315-16.pdf	application/PDF	Download
49	PNSJG200001715-16.pdf	application/PDF	Download
50	purchase request.pdf	application/PDF	Download
51	SujataMadam.pdf	        application/PDF	Download
52	frmMatPDFPreview.pdf	application/PDF	Download
53	G3 Motors Ltd.pdf	application/PDF	Download
54	parsan Overseas Pvt Ltd (1).pdf	application/PDF	Download
55	parsan Overseas Pvt Ltd.pdf	application/PDF	Download
58	irctcticket2.pdf       application/PDF	Download
60	Hacking.pdf	       application/PDF	Download