How to bind data to iCalender

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C#

ASP.NET

WebForms

I have a form which accepts start time,end time,start and end date,location and description for conference room booking.
On a button click i have set the code to create and .ics file which will generate and outlook file which will eventually book an appointment in my outlook calender for future reminder.
The problem is that the code only accepts static or predefined data for start time,endtime,date and etc.How can i bind the data that the user has selected from the form?

What I have tried:

public void ProcessRequest(HttpContext context)
    {

        StringBuilder str = new StringBuilder();        
        
      context.Response.Clear();
      context.Response.Charset = "";
      context.Response.ContentType = "text/calendar";
      context.Response.AddHeader("Content-Disposition", "inline; filename=\\Calender.ics");
      context.Response.BinaryWrite(new System.Text.ASCIIEncoding().GetBytes(@"BEGIN:VCALENDAR
PRODID:-//Microsoft Corporation//Outlook 12.0 MIMEDIR//EN
VERSION:1.0
BEGIN:VEVENT
DTSTART:20120515T113000Z

DTEND:20120515T113000Z
LOCATION:office
UID:040000008200E00074C5B7101A82E00800000000E09778CC8A2FCD01000000000000000
	010000000A616AC829938554DA102762D344287C7
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:=
=0D=0A
SUMMARY:calander
PRIORITY:3
END:VEVENT
END:VCALENDAR"));
        //Response.Write(); 
        context.Response.End();
    }