ASP.Net: Download File from URL to client browser using C# and VB.Net

Hi ramco1917,

First get the URL by deserialize and get the url.

Then you need to use a WebClient class for reading the url the byte data and use the byte to download the file. 

Please refer below sample.

Json

{
    "status": true,
    "data": "https://nimubs-assets.s3.amazonaws.com/manifest/20221226214955-57.pdf"
}

Namespaces

C#

using System.IO;
using System.Net;
using System.Web.Script.Serialization;

VB.Net

Imports System.IO
Imports System.Net
Imports System.Web.Script.Serialization

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    string json = File.ReadAllText(Server.MapPath("~/json.json"));
    JavaScriptSerializer serializer = new JavaScriptSerializer();
    Root root = serializer.Deserialize<Root>(json);
    using (WebClient webClient = new WebClient())
    {
        byte[] bytes = webClient.DownloadData(root.data);
        Response.Clear();
        Response.AddHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(root.data));
        Response.BinaryWrite(bytes);
        Response.Flush();
        Response.End();
    }
}

public class Root
{
    public bool status { get; set; }
    public string data { get; set; }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    Dim json As String = File.ReadAllText(Server.MapPath("~/json.json"))
    Dim serializer As JavaScriptSerializer = New JavaScriptSerializer()
    Dim root As Root = serializer.Deserialize(Of Root)(json)
    Using webClient As WebClient = New WebClient()
        Dim bytes As Byte() = webClient.DownloadData(root.data)
        Response.Clear()
        Response.AddHeader("Content-Disposition", "attachment; filename=" & Path.GetFileName(root.data))
        Response.BinaryWrite(bytes)
        Response.Flush()
        Response.End()
    End Using
End Sub

Public Class Root
    Public Property status As Boolean
    Public Property data As String
End Class

Screenshot