Display PDF File in a new Browser Tab on Button Click inside GridView ASP.Net

May be Popup is blocked in your browser.

Kindly download the article and make changes accordingly.

I have created a sample using this link and its working fine here.

Retrieve and Display PDF Files from database in browser in ASP.Net

All the other code will remain same.

Just edit this CS page code.

Cs.aspx.cs

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        this.BindGrid();
    }
}
private void BindGrid()
{
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlCommand cmd = new SqlCommand())
        {
            cmd.CommandText = "SELECT Id, Name FROM tblFiles";
            cmd.Connection = con;
            con.Open();
            GridView1.DataSource = cmd.ExecuteReader();
            GridView1.DataBind();
            con.Close();
        }
    }
}
protected void Upload(object sender, EventArgs e)
{
    string filename = Path.GetFileName(FileUpload1.PostedFile.FileName);
    string contentType = FileUpload1.PostedFile.ContentType;
    using (Stream fs = FileUpload1.PostedFile.InputStream)
    {
        using (BinaryReader br = new BinaryReader(fs))
        {
            byte[] bytes = br.ReadBytes((Int32)fs.Length);
            string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
            using (SqlConnection con = new SqlConnection(constr))
            {
                string query = "insert into tblFiles values (@Name, @ContentType, @Data)";
                using (SqlCommand cmd = new SqlCommand(query))
                {
                    cmd.Connection = con;
                    cmd.Parameters.AddWithValue("@Name", filename);
                    cmd.Parameters.AddWithValue("@ContentType", contentType);
                    cmd.Parameters.AddWithValue("@Data", bytes);
                    con.Open();
                    cmd.ExecuteNonQuery();
                    con.Close();
                }
            }
        }
    }
    Response.Redirect(Request.Url.AbsoluteUri);
}

protected void View(object sender, EventArgs e)
{
    int id = int.Parse((sender as LinkButton).CommandArgument);
    Session["Id"] = id;
    ClientScript.RegisterStartupScript(this.GetType(), "open", "window.open('Second.aspx','_blank' );", true);
}

Second.aspx

Add a new page name Second and add these code into it.

<form id="form1" runat="server">
<div>
    <hr />
    <div>
        <asp:Literal ID="ltEmbed" runat="server" />
    </div>
</div>
</form>

Second.aspx.cs

protected void Page_Load(object sender, EventArgs e)
{                
    if (!this.IsPostBack)
    {
        if (Session["Id"] != null)
        {
            int id = Convert.ToInt32(Session["Id"]);
            string embed = "<object data=\"{0}{1}\" type=\"application/pdf\" width=\"500px\" height=\"300px\">";
            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("~/FileCS.ashx?Id="), id);
        }
    }
}

Screenshot

I have tested it and its working in FF, IE 11 and Chrome