[MajedAlharbi]

وجدت الحل في أحد المواقع وهو انشاء كلاس Image

كود :

           Image img = null;
           using (Stream str = httpResponse.GetResponseStream())
           {
               img = Image.FromStream(str);
           }

           pictureBox1.Image = img;

الكود بعد التعديل

كود :

using System;
using System.Drawing;
using System.IO;
using System.Net;
using System.Windows.Forms;

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

       private void button1_Click(object sender, EventArgs e)
       {
           var url = "https://api.qr-code-generator.com/v1/create?access-token=pmiDgwkqwHkTMZsWYEg06eVk7yRFo2nJPabT93T5rqcBuQtJsZfyOYO2wG3a8Gvd";
           
           var httpRequest = (HttpWebRequest)WebRequest.Create(url);
           httpRequest.Method = "POST";

           httpRequest.ContentType = "application/json";

           var data = @"{
                  ""frame_name"": ""no-frame"",
                  ""qr_code_text"": ""https://www.qr-code-generator.com/"",
                  ""image_format"": ""JPG"",
                  ""qr_code_logo"": ""scan-me-square"",
                  ""download"": 1
                  }";

           using (var streamWriter = new StreamWriter(httpRequest.GetRequestStream()))
           {
               streamWriter.Write(data);
           }

           var httpResponse = (HttpWebResponse)httpRequest.GetResponse();

           Image img = null;
           using (Stream str = httpResponse.GetResponseStream())
           {
               img = Image.FromStream(str);
           }

           pictureBox1.Image = img;
       }
   }


}

تحياتي