I want to know how to use Asynchronous Processing SemaphoreSlim.Wait().I want to know why Task.Run is not running.

Block the current thread until it is in SemaphoreSlim.`

'HEIC_SimpleConverter.exe' (CoreCLR:clrhost): 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.10\System.ObjectModel.dll' loaded.Failed to read symbol.The module is optimized and the debug option My Code Only setting is enabled.
'HEIC_SimpleConverter.exe' (CoreCLR:clrhost): 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.10\System.Private.Uri.dll' loaded.Failed to read symbol.The module is optimized and the debug option My Code Only setting is enabled.
aaaaaa5
'HEIC_SimpleConverter.exe' (CoreCLR:clrhost): 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.10\System.ComponentModel.dll' loaded.Failed to read symbol.The module is optimized and the debug option My Code Only setting is enabled.
Thread 0x4710 ended with code 0(0x0).
Thread 0x2934 ended with code 0(0x0).
Thread 0x622c ended with code 0(0x0).

using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Runtime.CompilerServices;
using System.Runtime.ConstrainedExecution;
using System.Threading;
using System.Windows.Forms;
using ImageMagic;

namespace HEIC_SimpleConverter
{
    public partial class Form: System.Windows.Forms.Form
    {
        public Form()
        {
            InitializeComponent();
           
        }

        string saveFolder;
        SemaphoreSlim semaphore=new SemaphoreSlim(0,3);
        List<string>file=new List<string>();;
        float per = 0;
        US>//#string folderPath=";
        List<Task>task=new List<Task>();

        /*##########################################################################
        # When D&D is done
        ############################################################################*/
        private void Form_DragDrop(object sender, DragEventArgse)
        {
            string[]str=(string[])e.Data.GetData(DataFormats.FileDrop, false);
            // Debug.WriteLine(str[0]);

            for (inti=0;i<str.Length;i++)
            {
                file.Add(str[i]);
                listBox.Items.Add (Path.GetFileName(str[i]));
            }
        }


        /*##########################################################################
        # When the file is in the window,
        ############################################################################*/
        private void Form_DragEnter (object sender, DragEventArgse)
        {
            if(e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                string[]str=(string[])e.Data.GetData(DataFormats.FileDrop, false);

                pool flag = false;
                for (inti=0;i<str.Length;i++)
                {
                    string ext = Path.GetExtension(str[i]);
                    if((ext!=".HEIC")&(ext!="HEIF"))
                    {
                        flag = true;
                        break;
                    }
                }

                if(flag==true)
                {
                    e.Effect=DragDropEffects.None;
                }
                else
                {
                    e.Effect=DragDropEffects.All;
                }
            }
            else
            {
                e.Effect=DragDropEffects.None;
            }

        }

        /*##########################################################################
        # conversion button click
        ############################################################################*/
        private void button_Click (object sender, EventArgse)
        {
            folderBrowserDialog.ShowDialog(); // Save Location View
            folderPath=folderBrowserDialog.SelectedPath;//Contains storage location

            Convert(); // Save Directory Specification
        }


        /*##########################################################################
        # conversion
        ############################################################################*/
        private async void Convert()
        {
            progressBar.Value = 0;
            per = 100.0f/(float) file.Count();


            Debug.WriteLine("aaaaa" + file.Count);
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
            for (inti=0;i<file.Count;i++)
            {
                task.Add(Task.Run()=>
                {
                    semaphore.Wait();
                    Debug.WriteLine("file.Count" + file.Count);

                    Debug.WriteLine(file[4]);

                    /*
                    US>//#string filePath=folderPath+"/"+Path.GetFileName(file[i].ToString())+".jpeg";
                    string f = Path.ChangeExtension(file[i].ToString(), "jpeg");
                    ImageMagic.MagicImageimg = new ImageMagic.MagicImage(file[i].ToString());
                    img.Write(filePath);
                    img.Dispose();


                    This.Invoke(()=>{progressBar.Value+=(int)per;});
                    */

                    semaphore.Release();
                }));
            }
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
            button.Enabled = false;
            wait Task.WhenAll(task.ToArray());
            semaphore.Dispose();

            button.Enabled = true;

            // Reset
            progressBar.Value = 0;
            file.Clear();
            listBox.Items.Clear();
        }

        






        private void Form_Load (object sender, EventArgse)
        {

        }

        

    }
}