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How to use Thread to release the application from freezing in c#

I have the code below for scanning but When i press the button to start scanning, the windows form freezes and i can not move the form or minimizie/colse it until the process will be finished! i'm new in working with Thread but i tried to add Thread andi couldn't solve the problem.
Does anyone know to where (how) can i write a Thread to release my form from freezing?
Thanks.
public Bitmap GetBitmapFromRawData(int w, int h, byte[] data)
{
//Do sth
}
//button to start the scan proccess
private void button1_Click(object sender, EventArgs e)
{
try
{
var deviceManager = new DeviceManager();
for ( int i = 1; i <= deviceManager.DeviceInfos.Count; i++ )
{
if ( deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType )
{
continue;
}
lstListOfScanner.Items.Add(deviceManager.DeviceInfos[i].Properties["Name"].get_Value());
}
}
catch ( COMException ex )
{
MessageBox.Show(ex.Message);
}
try
{
var deviceManager = new DeviceManager();
DeviceInfo AvailableScanner = null;
for ( int i = 1; i <= deviceManager.DeviceInfos.Count; i++ )
{
if ( deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType ) // Skip device If it is not a scanner
{
continue;
}
AvailableScanner = deviceManager.DeviceInfos[i];
break;
}
var device = AvailableScanner.Connect();
var ScanerItem = device.Items[1];
var imgFile = (ImageFile)ScanerItem.Transfer();
var data = (byte[])imgFile.FileData.get_BinaryData();
var bitmap = GetBitmapFromRawData(imgFile.Width, imgFile.Height, data);
var Path = #"C:\....\ScanImg.jpg";
bitmap.Save(Path, ImageFormat.Jpeg);
}
catch ( COMException ex )
{
MessageBox.Show(ex.Message);
}

Try adopting the async/await approach:
private async void button1_Click(object sender, EventArgs e)
{
try
{
object[] items = await Task.Run<object[]>(() =>
{
var deviceManager = new DeviceManager();
List<object> result = new List<object>();
for (int i = 1; i <= deviceManager.DeviceInfos.Count; i++)
{
if (deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType)
{
continue;
}
result.Add(deviceManager.DeviceInfos[i].Properties["Name"].get_Value());
}
return result.ToArray();
});
foreach (var item in items)
{
lstListOfScanner.Items.Add(item);
}
}
catch (COMException ex)
{
MessageBox.Show(ex.Message);
}
try
{
await Task.Run(() =>
{
var deviceManager = new DeviceManager();
DeviceInfo AvailableScanner = null;
for (int i = 1; i <= deviceManager.DeviceInfos.Count; i++)
{
if (deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType) // Skip device If it is not a scanner
{
continue;
}
AvailableScanner = deviceManager.DeviceInfos[i];
break;
}
var device = AvailableScanner.Connect();
var ScanerItem = device.Items[1];
var imgFile = (ImageFile)ScanerItem.Transfer();
var data = (byte[])imgFile.FileData.get_BinaryData();
var bitmap = GetBitmapFromRawData(imgFile.Width, imgFile.Height, data);
var Path = #"C:\....\ScanImg.jpg";
bitmap.Save(Path, ImageFormat.Jpeg);
});
}
catch (COMException ex)
{
MessageBox.Show(ex.Message);
}
}

WPF User Interface not updating without moving mouse

I am using background work to load some content but something really odd is happening the UI is not updating and it just begin to happen suddenly,
here follows the code
here is the button click
public void CarregaPaginaCTeTomador(object sender, RoutedEventArgs e)
{
if (ClassControleInstancia.CTeTomador == null)
{
ClassControleInstancia.CTeTomador = new Page_CTE_Tomador();
}
BackgroundWorker LoadPageWorker = new BackgroundWorker();
LoadPageWorker.DoWork += LoadPageWorker_DoWorkCteTomador;
LoadPageWorker.RunWorkerCompleted += LoadPageWorker_RunWorkerCompleted;
LoadPageWorker.RunWorkerAsync();
}
here is the 1° background work
private void LoadPageWorker_DoWorkCteTomador(object sender, DoWorkEventArgs e)
{
Console.WriteLine("Antes do DoEvents");
System.Windows.Forms.Application.DoEvents();
Console.WriteLine("Apos o DoEvents");
ClassControleInstancia.JanelaPrincipal.Dispatcher.Invoke(() =>
{
_mainFrame.Navigate(ClassControleInstancia.CTeTomador);
ClassControleInstancia.CTeTomador.RefreshContent();
});
}
private void LoadPageWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
WaitNSeconds(80);
FrameCurrentPage();
}
Inside this ClassControleInstancia.CTeTomador.RefreshContent(); has another background work should this be the reason why the ui is getting stocked ?
Cause I am not seeing any problem with the code I am going mad cause I tried alread remove the bgwork but it still gets stocked.
the other bgwork is
private void CarregaGrid(int pagina, int quantidade, int TipoArquivo, int AscDesc, bool inognoreNot = false) //0 crescente 1 desc
{
//show the loader
ClassControleInstancia.JanelaPrincipal.Loader.Visibility = Visibility.Visible;
ClassControleInstancia.JanelaPrincipal.Loader_Abort.Visibility = Visibility.Hidden;
ClassControleInstancia.JanelaPrincipal.Loader_text.Visibility = Visibility.Hidden;
ClassControleInstancia.JanelaPrincipal.Loader_porgress.Visibility = Visibility.Hidden;
BackgroundWorker GridLoader = new BackgroundWorker();
GridLoader.DoWork += GridLoader_DoWork;
GridLoader.RunWorkerCompleted += GridLoader_RunWorkerCompleted;
GridLoader.RunWorkerAsync();
}
private void GridLoader_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
dgUsers.Items.Refresh();
ClassControleInstancia.JanelaPrincipal.Loader.Visibility = Visibility.Hidden;
ButtonsSelector config = new ButtonsSelector();
config.OnViewStart(TipoArquivoOrdenacaoEnum.CTE_NaoTomador, botoesSelector(), "cte-nao-tomador");
}
private void GridLoader_DoWork(object sender, DoWorkEventArgs e)
{
Dispatcher.Invoke((() =>
{
ClassControleInstancia.JanelaPrincipal.Loader_percentage.Width = new GridLength(0);
}));
CurrentPage = GridParams.Pagina;
CurrentMaxRows = GridParams.QuantidadePorPagina;
ObjSenhaWebApi Senha = new ObjSenhaWebApi(Conexao.ARQBancoDeDados().BuscaSenhaWebApiUsuario());
ObjPesquisaNotas PesquisaNotas = new ObjPesquisaNotas();
PesquisaNotas.IdEmpresa = ClassControleInstancia.EmpresaSelecionada.EMP_SEQUENCIA_ORI;
PesquisaNotas.Pagina = GridParams.Pagina;
PesquisaNotas.QntdMostrar = GridParams.QuantidadePorPagina;
PesquisaNotas.Ordenacao = GridParams.TipoArquivo;
PesquisaNotas.CrescenteDecrescente = GridParams.IsAscDesc;
PesquisaNotas._ObjListaParametrosNfeSaida = new ObjListaParametrosNfeSaida();
PesquisaNotas._ObjListaParametrosNfeSaida.UsuarioId = Conexao.ARQBancoDeDados().BuscaSequenciaClienteOri();
PesquisaNotas.tipoTomador = 1;
#region CamposDaPesquisa
P_ADICIONA_CAMPOS_PESQUISA(PesquisaNotas);
#endregion
int V_EMPRESA = 0;
string V_NUMERO_NOTA = "";
Dispatcher.Invoke((Action)(() => V_NUMERO_NOTA = EDT_NUMERO_NOTA.Text.Trim()));
if (ClassControleInstancia.EmpresaSelecionada != null)
{
V_EMPRESA = ClassControleInstancia.EmpresaSelecionada.EMP_SEQUENCIA;
string V_FORNECEDOR = "";
Dispatcher.Invoke((Action)(() => V_FORNECEDOR = CbFornecedor.Text.ToString()));
Dispatcher.Invoke((Action)(() => dgUsers.ItemsSource = null));
List<Cte> ListaNotas = ArquivarNfeRest.ArquivarNfeRest.BuscaNotaSaida<Cte>(Senha, PesquisaNotas);
if (ListaNotas != null)
{
if (ListaNotas.Count() > 0)
{
Dispatcher.Invoke((Action)(() => nuvenzita_no_itens.Visibility = Visibility.Hidden));
}
else
{
Dispatcher.Invoke((Action)(() => nuvenzita_no_itens.Visibility = Visibility.Visible));
}
}
else
{
Dispatcher.Invoke((Action)(() => nuvenzita_no_itens.Visibility = Visibility.Visible));
}
//Colocar em negrito todos os matchs com a outra lista
List<string> ListaNegrito = ClassControleListaNegrito.BuscaLista(ClassControleInstancia.EmpresaSelecionada.EMP_SEQUENCIA, TipoArquivoOrdenacaoEnum.CTE_NaoTomador, true).ValorLista;
foreach (var item in ListaNotas)
{
foreach (var item2 in ListaNegrito)
{
if (item2 == item.CteSequencia.ToString())
{
item.NEGRITO = true;
}
}
}
ObjRetornoCount _ObjRetornoCount = ArquivarNfeRest.ArquivarNfeRest.BuscaQntdNotaSaida<Cte>(Senha, PesquisaNotas);
int QntdPaginas = _ObjRetornoCount.QntdPaginas;
int QntdNotas = _ObjRetornoCount.QntdTotal;
//Retira aviso vermelho (confima letura)
if (GridParams.IgnorarAlerta != true)
{
ClassDoReadNotification<Cte>.Verify();
ClassControleInstancia.Notifications.IsCteNaoTomadorRead = 1;
ClassControleInstancia.JanelaPrincipal.AlertaNovasNotas();
}
Dispatcher.Invoke((Action)(() =>
{
totalItensFiltrados = QntdNotas;
itensNoFiltro = ListaNotas;
if (VerificaSeTemFiltro() == 0)
{
paginatorTotal.Content = "Nº Total Doctos: " + (QntdNotas);
}
else
{
paginatorTotal.Content = "Nº Total Doctos Filtrados: " + (QntdNotas);
}
Pagenizer.getButtons(footer, QntdPaginas, CurrentPage, CurrentMaxRows, "cte-nao-tomador");
}));
//List<ObjSincronizados> ListaNotas = Conexao.ARQBancoDeDados().BuscaListaSincronizados(V_EMPRESA, V_NUMERO_NOTA, V_DATA_INICIAL, V_DATA_FINAL, V_FORNECEDOR);
Dispatcher.Invoke((Action)(() => dgUsers.ItemsSource = ListaNotas));
Dispatcher.Invoke((Action)(() =>
{
int tt = dgUsers.Items.OfType<Cte>().Where(x => x.MARCADO == true).Count();
int ttAll = dgUsers.Items.OfType<Cte>().Where(x => x.MARCADO == true || x.MARCADO == false).Count();
btCounter.Content = "Selecionados " + tt.ToString() + " de " + ttAll.ToString();
headerCheckBox.IsChecked = false;
}
));
}
}

Why i'm getting cross thread exception while updating label in backgroundworker progresschanged event?

I have a backgroundworker dowork where inside I start a new backgroundworker
DirectoryInfo MySubDirectory;
List<FileInfo> l;
object[] CurrentStatus;
private void _FileProcessingWorker_DoWork(object sender, DoWorkEventArgs e)
{
int countmore = 0;
try
{
DirectoryInfo[] MySubDirectories = (DirectoryInfo[])e.Argument;
for (int i = 0; i < MySubDirectories.GetLength(0); i++)
{
MySubDirectory = MySubDirectories[i];
l = new List<FileInfo>();
if (_FileCountingWorker.IsBusy == false)
_FileCountingWorker.RunWorkerAsync();
CurrentStatus = new object[6];
int totalFiles = l.Count;
CurrentStatus[3] = i.ToString();
countmore += totalFiles;
CurrentStatus[4] = countmore;
_FileProcessingWorker.ReportProgress(0, CurrentStatus);
string CurrentDirectory = "Current Directory: " + MySubDirectory.Name;
foreach (FileInfo MyFile in l)
{
CurrentStatus = new object[6];
if (_FileProcessingWorker.CancellationPending)
{
e.Cancel = true;
return;
}
if (MyFile.Extension.ToLower() == ".cs" || MyFile.Extension.ToLower() == ".vb")
{
string CurrentFile = "Current File: " + MyFile.Name;
string CurrentFileWithPath = MyFile.FullName;
CurrentStatus[0] = CurrentDirectory;
CurrentStatus[1] = CurrentFile;
_FileProcessingWorker.ReportProgress(0, CurrentStatus);
List<string> Result = SearchInFile(CurrentFileWithPath, "if");
if (Result != null && Result.Count > 0)
{
CurrentStatus[2] = Result;
_FileProcessingWorker.ReportProgress(0, CurrentStatus);
}
}
}
}
}
catch (Exception err)
{
return;
}
}
I'm checking the other backgroundworker is not busy if not start it
if (_FileCountingWorker.IsBusy == false)
_FileCountingWorker.RunWorkerAsync();
In the new backgroundworker dowork event
private void _FileCountingWorker_DoWork(object sender, DoWorkEventArgs e)
{
CountFiles(MySubDirectory, l);
}
In CountFiles
int countingFiles = 0;
private void CountFiles(DirectoryInfo di, List<FileInfo> l)
{
try
{
l.AddRange(di.EnumerateFiles());
}
catch
{
string fff = "";
}
try
{
if (di.FullName != BasePath)
{
IEnumerable<DirectoryInfo> subDirs = di.EnumerateDirectories();
if (subDirs.Count() > 0)
{
foreach (DirectoryInfo dir in subDirs)
{
CountFiles(dir, l);
countingFiles += 1;
if (countingFiles == 8382)
{
string hhhhh = "";
}
CurrentStatus[5] = countingFiles;
_FileCountingWorker.ReportProgress(0,CurrentStatus);
}
}
}
}
catch
{
string yyy = "";
}
}
Then in the second backgroundworker progresschanged
private void _FileCountingWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
if (typeof(object[]) == e.UserState.GetType())
{
object[] StatusMsg = (object[])e.UserState;
if (6 == StatusMsg.GetLength(0))
{
if (StatusMsg[5] != null)
{
lblCountingFiles.Text = StatusMsg[5].ToString();
}
}
}
}
The exception is on the line:
lblCountingFiles.Text = StatusMsg[5].ToString();
Cross-thread operation not valid: Control 'lblCountingFiles' accessed from a thread other than the thread it was created on
I'm updating the label in the ProgressChanged event. Why am I getting the exception?
And how should I solve it?

You are calling _FileCountingWorker.RunWorkerAsync(); in DoWork from another BackgroundWorker thread.
So when _FileCountingWorker reports progress it wont come back to the UI thread because it is not started from UI thread. That's why you are getting cross thread exception.
Try to call _FileCountingWorker.RunWorkerAsync() from UI thread or from _FileProcessingWorker_ProgressChanged event.
Otherwise you can use:
private void _FileCountingWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
if (!Dispatcher.CheckAccess()) // CheckAccess returns true if you're on the dispatcher thread
{
Dispatcher.Invoke(new Action<object, ProgressChangedEventArgs>(_FileCountingWorker_ProgressChanged), sender, e);
return;
}
if (typeof(object[]) == e.UserState.GetType())
{
object[] StatusMsg = (object[])e.UserState;
if (6 == StatusMsg.GetLength(0))
{
if (StatusMsg[5] != null)
{
lblCountingFiles.Text = StatusMsg[5].ToString();
}
}
}
}

I think the problem is on the main thread you have
object[] CurrentStatus;
in the background you could be newing it before reports progress gets to it
(or at the same time)
kill the above
just create the object in the do_work
object[] CurrentStatus = new object[6];

Program stops working after minimizing any window in Windows

The program uses two threads: one for collecting the data from USB, and the other writes/displays the data. It seems to work as expected, however, as soon as I minimize/restore any windows on the PC, or press any buttons on the Form, it stops working properly (it stops receiving data). I use link list to keep the data streaming in order. I suspect that maybe the link is lost somewhere because of improper variable declaration. Is there an obvious mistake in my code that could be causing this?
namespace Streamer
{
public class Form1 : System.Windows.Forms.Form
{
Thread tListen;
Thread tDisplay;
public class MY_DATA_BUFFER
{
public byte[] buffer;
public int length;
public MY_DATA_BUFFER nextBuff;
}
private Object thisLock = new Object();
MY_DATA_BUFFER pHead = null;
private static AutoResetEvent DataQueueEvent = new AutoResetEvent(false);
public Form1()
{
// some settings;
}
public unsafe void dataDisplayThread()
{
MY_DATA_BUFFER pWorkingSet = pHead;
if (pWorkingSet == null)
{
// Make sure link list head is initialized...........
do {DataQueueEvent.WaitOne();} while (pHead == null);
// Wait till the two datas are available to write.
if (pHead.nextBuff == null){ DataQueueEvent.WaitOne(); }
if (pWorkingSet == null) { pWorkingSet = pHead; }
}
// Let's start the data write loop
while (bRunning || (pWorkingSet != null))
{
// copy small array to a bigger array
for (int i = 0; i < pWorkingSet.length; i++)
{
pixelValues[pixptr] = pWorkingSet.buffer[i];
pixptr++;
}
if (pixptr >= imWidth * imHeight)
{
pixptr = 0;
// show data in pixelValues
}
// Traverse through the link list data structure.
if (pWorkingSet.nextBuff == null)
{
do
{
if (pWorkingSet.nextBuff == null DataQueueEvent.WaitOne();
lock (thisLock)
{
if (pWorkingSet.nextBuff == null && !bRunning)
break;
}
} while (pWorkingSet.nextBuff == null);
}
// We are good to loop for the next operation
lock (thisLock)
{
pHead = pHead.nextBuff;
pWorkingSet = pHead;
}
}
// All write operation is at completion
pHead = null;
}
public unsafe void XferData(...)
{
MY_DATA_BUFFER tempBuff = null;
for (; bRunning; )
{
// .... do something
// push the data to a link list for
lock (thisLock)
{
MY_DATA_BUFFER newBuff = new MY_DATA_BUFFER();
newBuff.nextBuff = null;
newBuff.buffer = xBufs[k];
newBuff.length = len;
if (tempBuff == null) tempBuff = newBuff;
else
{
tempBuff.nextBuff = newBuff;
tempBuff = newBuff;
}
if (pHead == null) pHead = newBuff;
else
{
DataQueueEvent.Set();
}
}
///////////////////Link List Population completes///////////
Thread.Sleep(0);
} // End infinite loop
}
private void StartBtn_Click(object sender, System.EventArgs e)
{
if (StartBtn.Text.Equals("Start"))
{
// ...
pHead = null;
bRunning = true;
tListen = new Thread(new ThreadStart(XferThread));
tListen.IsBackground = true;
tListen.Priority = ThreadPriority.Highest;
tListen.Start();
tDisplay = new Thread(new ThreadStart(dataDisplayThread));
tDisplay.IsBackground = true;
tDisplay.Priority = ThreadPriority.Highest;
tDisplay.Start();
}
else
{
if (tListen.IsAlive)
{
// ...
bRunning = false;
if (tListen.Join(5000) == false )
tListen.Abort();
tListen = null;
}
if (tDisplay.IsAlive)
{
if (tDisplay.Join(5000) == false )
tDisplay.Abort();
Display = null;
}
}
}
}
}

How to Fire an event for another Control while performing DataGridView_CellContentClick?

Actually, I have fired an event on DataGridView_CellContentClick which perform an operation relating to datagridview like changing cell's value But before performing this action i want to make changes(or fire) an another operation on another control i.e. ListView .But this is not gone happens although i place another operation before datagridview's operation. Anybody please help me out.
And my code goes like this:-
private void dGridDeviceList_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
//DataGridViewCell dcell = dGridDeviceList.Rows[e.RowIndex].Cells[e.ColumnIndex];
if (e.RowIndex >= 0)
{
ListViewItem litem1 = lvInformation.Items.Add("101");
litem1.SubItems.Add(string.Empty);
litem1.SubItems[1].Text = "Connected.";
ListViewItem litem5= lvErrorList.Items.Add("check ");
Cursor = Cursors.WaitCursor;
List<cException> cxp = new List<cException>();
cDeviceModel cdm = new cDeviceModel();
ListViewItem litem = new ListViewItem();
DataGridViewRow drow = new DataGridViewRow();
cDeviceUtility cUtil = new cDeviceUtility();
List<cAction> catn = new List<cAction>();
drow = dGridDeviceList.Rows[e.RowIndex];
cdm = (cDeviceModel)drow.Tag;
if (e.ColumnIndex == 6)
{
if (dGridDeviceList.CurrentCell.Value.ToString() == "Connect")
{
litem1= lvInformation.Items.Add("101");
litem1.SubItems.Add(string.Empty);
litem1.SubItems[1].Text = "Connected.";
//lvInformation.Items.Insert(0, "101");
//lvInformation.Items[0].SubItems.Add("Connected");
}
// connect disconnect button column
if (cdm.IsConnected)
{
ListViewItem litem2 = lvInformation.Items.Add("102");
litem2.SubItems.Add(string.Empty);
litem2.SubItems[1].Text =string.Format("Disconnecting from {0} device.",dGridDeviceList.CurrentRow.Cells["colDeviceName"].Value);
// then disconnect the device
cdm.IsConnected = false;
cdm.DeviceInterface.Disconnect();
dGridDeviceList.Rows[e.RowIndex].Tag = cdm;
dGridDeviceList.Rows[e.RowIndex].Cells[6].Value = "Connect";
dGridDeviceList.Rows[e.RowIndex].Cells[1].Value = img16x16.Images["notconnected"];
dGridDeviceList.Rows[e.RowIndex].Cells[8].Value= 0;
dGridDeviceList.Rows[e.RowIndex].Cells[8].Tag = "Not Connected";
dGridDeviceList.Refresh();
litem2 = lvInformation.Items.Add("103");
litem2.SubItems.Add(string.Empty);
litem2.SubItems[1].Text = string.Format("Disconnected from {0} device.", dGridDeviceList.CurrentRow.Cells["colDeviceName"].Value);
}
else
{
// string test = lvInformation.Items[0].SubItems[1].ToString();
// catn.Add(new cAction { Number = lvInformation.Items.Count+1, Message = string.Format("Trying to connect with {0}", dGridDeviceList.Rows[e.RowIndex].Cells["colDeviceName"].Value) });
//// lvInformation.Items.Clear();
// foreach (cAction Actn in catn)
// {
// litem=lvInformation.Items.Insert(0, (lvInformation.Items.Count + 1).ToString());
// litem.SubItems.Add(catn[catn.Count -1].Message);
// }
// then connect the device
if (!ConnectToDevice(ref drow, out cxp) == true)
{
foreach (cException err in cxp)
{
litem = lvErrorList.Items.Insert(0, err.Number.ToString());
if (err.EType == ErrorType.Error)
{
litem.ImageKey = "error";
}
else if (err.EType == ErrorType.Warning)
{
litem.ImageKey = "warning";
}
else if (err.EType == ErrorType.Information)
{
litem.ImageKey = "information";
}
litem.SubItems.Add(err.Message);
litem.SubItems.Add(err.Source);
}
}
else
{
dGridDeviceList.Rows[e.RowIndex].Cells[0].Value = true;
dGridDeviceList.Rows[e.RowIndex].Tag = drow.Tag;
dGridDeviceList.Rows[e.RowIndex].Cells[6].Value = "Disconnect";
dGridDeviceList.Rows[e.RowIndex].Cells[1].Value = img16x16.Images["connected"];
dGridDeviceList.Rows[e.RowIndex].Cells[8].Value = 0;
dGridDeviceList.Rows[e.RowIndex].Cells[8].Tag = "Ready";
dGridDeviceList.Refresh();
RemoveSelectionRow();
}
}
}
else if (e.ColumnIndex == 7)
{
// view logs button column
pbarMain.Value = 100;
ViewLogs(dGridDeviceList.Rows[e.RowIndex],ref lvAttnLog ,ref lvErrorList);
}
Cursor = Cursors.Arrow;
}
}

considering this is winform
private void buttonCopyContent_Click(object sender, EventArgs e)
{
//do something
}
you can call this event via following line
this.Invoke(new EventHandler(buttonCopyContent_Click));