Hi indradeo,

I have refer below article link to make the sample.

Display (View) PDF file without downloading using JavaScript

Please refer below sample.

HTML

Home Page

<div>
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" EmptyDataText="No files uploaded" Height="146px" Width="320px">
        <Columns>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:LinkButton ID="lnkDownload" Text="View File" CommandArgument='<%# Eval("Text") %>' runat="server" OnClick="ViewFile"></asp:LinkButton>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
</div>

Default Page

<%= DateTime.Now.ToString("dd/MM/yyyy")%>
<hr />
<div id="pdf_container"></div>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.6.347/pdf.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.6.347/pdf_viewer.min.css" rel="stylesheet" type="text/css" />
<script type="text/javascript">
    var pdfjsLib = window['pdfjs-dist/build/pdf'];
    pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.6.347/pdf.worker.min.js';
    var pdfDoc = null;
    var scale = 1; //Set Scale for zooming PDF.
    var resolution = 1; //Set Resolution to Adjust PDF clarity.
    window.onload = LoadPdfFromUrl();
    function LoadPdfFromUrl() {
        var url = "Report/" + location.search.split('=')[1];
        //Read PDF from URL.
        pdfjsLib.getDocument(url).promise.then(function (pdfDoc_) {
            pdfDoc = pdfDoc_;

            //Reference the Container DIV.
            var pdf_container = document.getElementById("pdf_container");
            pdf_container.style.display = "block";

            //Loop and render all pages.
            for (var i = 1; i <= pdfDoc.numPages; i++) {
                RenderPage(pdf_container, i);
            }
        });
    };
    function RenderPage(pdf_container, num) {
        pdfDoc.getPage(num).then(function (page) {
            //Create Canvas element and append to the Container DIV.
            var canvas = document.createElement('canvas');
            canvas.id = 'pdf-' + num;
            ctx = canvas.getContext('2d');
            pdf_container.appendChild(canvas);

            //Create and add empty DIV to add SPACE between pages.
            var spacer = document.createElement("div");
            spacer.style.height = "20px";
            pdf_container.appendChild(spacer);

            //Set the Canvas dimensions using ViewPort and Scale.
            var viewport = page.getViewport({ scale: scale });
            canvas.height = resolution * viewport.height;
            canvas.width = resolution * viewport.width;

            //Render the PDF page.
            var renderContext = {
                canvasContext: ctx,
                viewport: viewport,
                transform: [resolution, 0, 0, resolution, 0, 0]
            };

            page.render(renderContext);
        });
    };
</script>

Namespace

using System.IO;

Code

Home Page

protected void Page_Load(object sender, EventArgs e)
{
    string[] filePaths = Directory.GetFiles(Server.MapPath("~/Report/"));
    List<ListItem> files = new List<ListItem>();
    foreach (string filePath in filePaths)
    {
        files.Add(new ListItem(Path.GetFileName(filePath), filePath));
    }
    GridView1.DataSource = files;
    GridView1.DataBind();
}
protected void ViewFile(object sender, EventArgs e)
{
    string url = string.Format("Default.aspx?FN={0}", (sender as LinkButton).CommandArgument);
    string script = "<script type='text/javascript'>window.open('" + url + "')</script>";
    this.ClientScript.RegisterStartupScript(this.GetType(), "script", script);
}

Screenshot