c# when i close form 2 ( from dll ) it will close form 1 as well

hello all,

i have created a program ui and working fine however i have made a downloader class that is a dll with a form in it with other functions

got download working perfectly fine call it though a aync methord and put a call in for it but i have a issue with form 2 when i finished the download i use this.close()

and it closes both form 1 and form 2 for some reason i dont want to hide it i want to open it close it only code i have

calling function

public async Task webtest()  
        {  
            //kaori_webdownloader elfenform = new kaori_webdownloader();  
            //elfenform.Show();  
            ////await elfenform.downloadupdate();  
            //// await elfenform.httpdownload();  
            //await elfenform.downloaderpython("");  
  
  
            if (IsVC2015Installed() == false)  
            {  
                kaori_webdownloader elfenvs = new kaori_webdownloader();  
                elfenvs.Show();  
                await elfenvs.downloadervs2019("");  
            }  
            else  
            {  
                XtraMessageBox.Show("VS 2019 Already installed.");  
            }  
  
        }  

and this is the download functions.

  public async Task downloadervs2019(string path)  
        {  
  
            if (os == "x86")  
            {  
                path = @"C:\Temp\" + "vc_redist.x64.exe";  
                filepath = path;  
                filename = "vc_redist.x64.exe";  
                httpdownloader = new HttpDownloader("https://aka.ms/vs/17/release/vc_redist.x64.exe", @"C:\Temp\" + Path.GetFileName("https://aka.ms/vs/17/release/vc_redist.x64.exe"));  
                httpdownloader.DownloadCompleted += Httpdownloader_DownloadCompleted;  
                httpdownloader.ProgressChanged += Httpdownloader_ProgressChanged;  
                Task.Run(() => httpdownloader.Start());  
            }  
            else  
            {  
                path = @"C:\Temp\" + "vc_redist.x86.exe";  
                filepath = path;  
                filename = "vc_redist.x86.exe";  
                httpdownloader = new HttpDownloader("https://aka.ms/vs/17/release/vc_redist.x86.exe", @"C:\Temp\" + Path.GetFileName("https://aka.ms/vs/17/release/vc_redist.x86.exe"));  
                httpdownloader.DownloadCompleted += Httpdownloader_DownloadCompleted;  
                httpdownloader.ProgressChanged += Httpdownloader_ProgressChanged;  
                Task.Run(() => httpdownloader.Start());  
            }  
  
        }  


private void Httpdownloader_ProgressChanged(object sender, AltoHttp.ProgressChangedEventArgs e)  
        {  
            UpdateProgressBar((int)e.Progress);  
            lbl_percent.Text = $"{e.Progress.ToString("0.00")} %";  
            lbl_speed.Text = string.Format("{0} MB/s", (e.SpeedInBytes / 1024d / 1024d).ToString("0.00"));  
            lbl_downloaded.Text = string.Format("{0} MB/s", (httpdownloader.TotalBytesReceived / 1024d / 1024d).ToString("0.00"));  
            lbl_status.Text = "Downloading: " + filename;  
  
        }  
  
        private void Httpdownloader_DownloadCompleted(object sender, EventArgs e)  
        {  
  
            try  
            {  
  
                this.Invoke((MethodInvoker)delegate  
               {  
                   lbl_status.Text = "Finished !";  
                   lbl_percent.Text = "100%";  
               });  
                //Process.Start(filepath);  
                workerThread = new Thread(new ThreadStart(this.WorkerThread));  
                workerThread.Start();  
                using (Process p = new Process())  
                {  
                    XtraMessageBox.Show(filepath);  
                    p.StartInfo.FileName = filepath;  
                    p.Start();  
                      
                }  
                  
            }  
            catch(Exception ex)  
            {  
                XtraMessageBox.Show(ex.Message);  
            }  
  
              
              
  
        }  
  
  
        public void closeme()  
        {  
            kaori_webdownloader elfen = new kaori_webdownloader();  
            elfen.Close();  
        }  

and on the main form i have a refrence to to kaori dll,

and simple button click you

kaorires elfenres = new kaorires()
elfenres.Webtest();