Pass (Send) multiple parameters as QueryString to Generic Handler in ASP.Net

How to pass multiple parameter in QueryString in ASP.Net

I wanted to pass 2 parameter value to display pdf file, I am using below code but it is not working. 

    Protected Sub ViewFile(sender As Object, e As EventArgs)
        Dim commandArgs() As String = CType(sender, LinkButton).CommandArgument.ToString.Split(New Char() {Microsoft.VisualBasic.ChrW(44)})
        Dim t_orno As String = commandArgs(0)
        Dim t_dcno As String = commandArgs(1)
        Dim embed As String = "<object data=""{0}{1}"" type=""application/pdf""width=""100%"" height=""660px"">"
        embed += "If you are unable to view file, you can download from <a href = ""{0}{1}&download=1"">here</a>"
        embed += " or download <a target = ""_blank"" href = ""http://get.adobe.com/reader/"">Adobe PDF Reader</a> to view the file."
        embed += "</object>"
        ltEmbed.Text = String.Format(embed, ResolveUrl("~/OpenDocs.ashx?t_orno=&t_dcno"), t_orno, t_dcno)
    End Sub

OpenDocs.ashx

    Public Sub ProcessRequest(context As HttpContext) Implements IHttpHandler.ProcessRequest
        Dim t_orno As String = Convert.ToString(context.Request.QueryString("t_orno"))
        Dim t_dcno As String = Convert.ToString(context.Request.QueryString("t_dcno"))

        Dim bytes As Byte()
        Dim t_dext As String
        dbconn.OpenConnection()
        Dim cmd As New SqlCommand()
        cmd.CommandText = "select t_orno, t_text, t_dext  from t_docs where t_orno=@t_orno AND  t_dcno=@t_dcno"
        cmd.Parameters.AddWithValue("@t_orno", t_orno)
        cmd.Parameters.AddWithValue("@t_dcno", t_dcno)
        cmd.Connection = dbconn.con
        Dim sdr As SqlDataReader = cmd.ExecuteReader()
        sdr.Read()
        bytes = DirectCast(sdr("t_text"), Byte())
        t_dext = sdr("t_dext").ToString()
        dbconn.CloseConnection()

        context.Response.Buffer = True
        context.Response.Charset = ""
        If context.Request.QueryString("download") = "1" Then
            context.Response.AppendHeader("Content-Disposition", Convert.ToString("attachment; filename=") & t_orno + t_dext)
        End If
        context.Response.Cache.SetCacheability(HttpCacheability.NoCache)
        context.Response.ContentType = "application/pdf"
        context.Response.BinaryWrite(bytes)
        context.Response.Flush()
        context.Response.[End]()
    End Sub

    Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
        Get
            Return False
        End Get
    End Property