Unable to upload large file using webclient class in the ASP.NET C# web application

See more:

C#

.NET

web.config

WebClient

I need to upload a file to virus checking site using this code

public string Scan(string file)
{
    var v = new NameValueCollection();
    v.Add("key", APIKey);
    var c = new MyWebClient() { QueryString = v };
    
    c.Headers.Add("Content-type", "binary/octet-stream");
    ServicePointManager.SecurityProtocol = (SecurityProtocolType)768 | (SecurityProtocolType)3072;
    byte[] b = c.UploadFile(scan, "POST", file);
    string json = Encoding.Default.GetString(b);
    var r = ParseJSON(json);
    if (r.ContainsKey("scan_id"))
    {
        return r["scan_id"];
    }
    throw new Exception(r["result"]);
}

This code works fine with smaller files, but once I try to upload files of 50 MB size I get the exception

The remote server returned an error: (413) Request Entity Too Large.

I did lookup this error and tried increase the maxAllowedContentLength and maxRequestLength values to 2147483647

It didn't help. No matter what I do, I always get the error mentioned above

Is there any way to upload the large file to a site using the WebClient class? Is there any other way to upload the larger file in the ASP.NET Web Forms?

Thank you very much in advance

What I have tried:

I did lookup this error and tried increase the maxAllowedContentLength and maxRequestLength values to 2147483647