Download a zip file from a website by submitting userid and password in C#

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C#

Hello,

I would like to download the zip file using C#.

The C# code should go to web page Platts Market Center and enter user ID and password then click on submit.

Post which, the next page would open in that we have a grid. The code should click on the zip file in the "45 days column" and download the zip file.

The detailed excel file with screenshot can be downloaded from below link.

Platts_Data.xlsx

Getting error at this line :

wb.DownloadFile(downloadUri, destination);

Error Message=Too many automatic redirections were attempted.

Thanks,
Akash

What I have tried:

    class Program
    {
        static void Main(string[] args)
        {
            string strDatetimestamp = DateTime.Now.ToUniversalTime().ToString("yyyy-mm-dd-hh-mm-ss");

            string LoginUrl = "https://pmc.platts.com/Login.aspx";
            string Referer = "https://pmc.platts.com/Login.aspx";
            string _userName = "abc@xyz.com"; // please change
            string _password = "abcdefghi"; // please change
            string downloadUri = "https://pmc.platts.com/MQT/MQTHandler.aspx?fn=Platts_Market_Data_BA_hist-" + strDatetimestamp + ".zip"; // please change
            string destination = Path.Combine(@"C:\", "Platts_Market_Data_BA_hist - " + strDatetimestamp + ".zip");  //please change
            string postData = String.Format("logonid={0}&logonpswd={1}&Log On=Log On", _userName, _password);

            string cookie = HTTHelper.ProcessLogin(postData, LoginUrl, Referer);

            WebClient wb = new WebClient();
            wb.Headers.Add(HttpRequestHeader.Cookie, cookie);
            wb.DownloadFile(downloadUri, destination);
        }
    }
}