C# - how do I "connect" my console application code to my windows forms GUI?

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Visual-Studio

WinForms

C#3.5

API

I am attempting to create a program, where in the Windows Forms Form, the user clicks on a button, is able to choose an image from the file explorer, which is displayed in a picture box. With the Console application code, the file path of the image is then used to find the image, turn it into a byte array, and then send it along with necessary API keys to an API. This then returns a response, which I would like to output in the Form in a textbox.

The issue is, is that I am unable to get the two parts of my project to "talk' to each other - I cannot "call" the tasks in the form.cs from the progam.cs, which may be because they are async? I am a beginner to C#, and I am not sure if combining these two elements into one program is even possible.

Here is my forms.cs code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace customvisionframework
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string Chosen_File = "";


            openFD.InitialDirectory = "C:";
            openFD.Title = "Submit an Image";
            openFD.FileName = "";
            openFD.Filter = "JPEG Images|*.jpg|GIF Images|*.gif";

            if (openFD.ShowDialog() == DialogResult.Cancel)
            {
                MessageBox.Show("Operation Cancelled");
            }
            else
            {
                Chosen_File = openFD.FileName;
                pictureBox1.Image = Image.FromFile(Chosen_File);
                string imageFilePath = Path.GetDirectoryName(Chosen_File); //ideally i would then call the method/task MakePredictionRequest(string imageFilePath) but it says 'makepredictionrequest' doesn't exist in this context



            }

        }
    }
}

and here is my program.cs code:

using System;
using Newtonsoft.Json;
using System.IO;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;
using System.Text;
using System.Web;
using System.Windows.Forms;
using customvisionframework;

namespace fakeBrokenBones
{
    public static class Program
    {

        public static void Main()
        {
            Application.EnableVisualStyles();

            Application.Run(new Form1());
            
        }
        // MAKING THE PREDICTION REQUEST

        public static async Task MakePredictionRequest(string imageFilePath)
        {
            //create a new HTTP request
            var client = new HttpClient();

            // adding valid Prediction-Key to Header.
            client.DefaultRequestHeaders.Add("Prediction-Key", "prediction key");

            // this is the URL of the Prediction API that the HTTP request will be sent to.
            string url = "api url";

            HttpResponseMessage response;

            // the byte array created from the image submitted is then added to the body of the HTTP request.
            byte[] byteData = GetImageAsByteArray(imageFilePath);


            using (var content = new ByteArrayContent(byteData))
            {
                // sets the Content Type Header of the HTTP request to "application/octet-stream".
                content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");

                // SENDING A REQUEST

                // sends HTTP request to the Prediction URL using the POST request method as an asynchronous operation.
                response = await client.PostAsync(url, content);
                // returns response from Prediction API, which has been serialised, as a string.

                //RETRIEVING A RESPONSE

                var responseString = await response.Content.ReadAsStringAsync();
                // this response is then deserialised so that the desired data can be extracted.
                dynamic stuff = JsonConvert.DeserializeObject<object>(responseString);
                string broken = stuff.predictions[0].probability;
                string negative = stuff.predictions[1].probability;
//ideally then I could use output the string negative and string broken in a rich textbox in my GUI>

            }


        }
        // CONVERTING FILE TO BYTE ARRAY

        private static byte[] GetImageAsByteArray(string imageFilePath)
        {
            // image from specified file path is open and read
            FileStream fileStream = new FileStream(imageFilePath, FileMode.Open, FileAccess.Read);
            // intialises BinaryReader class to convert image to binary
            BinaryReader binaryReader = new BinaryReader(fileStream);
            return binaryReader.ReadBytes((int)fileStream.Length);
        }
    }
}

What I have tried:

I've looked everywhere, but I can't see anything that resembles my problem. I've tried copying all my program.cs code into the forms.cs, but it really doesn't like that either.

At this point, I just want to know if this is actually possible, because I've spent so many hours trying to make it work to no avail. If there is a way to do this, I would be so grateful and appreciative if you could help me.