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System.Windows.Forms.WebBrowser wait until page has been fully loaded

I have been trying a lot of different solutions with wait and async. Nothing seems to work. I was not able to find solution that actually fully waits until page has been fully loaded. All codes are waiting some time but not until page has been loaded and I am getting an error on next process.
How I can set for example code into wait mode until Document.GetElementById("quickFind_text_0") element has been found on page?
Here is my code:
private void button7_Click(object sender, EventArgs e)
{
webBrowser1.Navigate("https://company.crm4.dynamics.com/main.aspx?app=d365default&pagetype=entitylist&etn=opportunity");
webBrowser1.Document.GetElementById("shell-container").Document.GetElementById("quickFind_text_0").SetAttribute("value", "Airbus");
webBrowser1.Document.GetElementById("shell-container").Document.GetElementById("quickFind_text_0").InnerText = "Airbus";
//Thread.Sleep(2000);
HtmlElement fbLink = webBrowser1.Document.GetElementById("shell-container").Document.GetElementById("mainContent").Document.GetElementById("quickFind_button_0"); ;
fbLink.InvokeMember("click");
}
P.S. I have to do this "twice" otherwise it is not working:
webBrowser1.Document.GetElementById("shell-container").Document.GetElementById("quickFind_text_0").SetAttribute("value", "Airbus");
webBrowser1.Document.GetElementById("shell-container").Document.GetElementById("quickFind_text_0").InnerText = "Airbus";
In VBA this works:
While .Busy
DoEvents
Wend
While .ReadyState <> 4
DoEvents
Wend
Is it possible to do the same in C#?
EDIT:
My full code below. For some reason async/await does not work.
System.NullReferenceException HResult=0x80004003 Message=Object
reference not set to an instance of an object. Source=v.0.0.01
StackTrace: at v._0._0._01.Browser.<button7_Click>d__7.MoveNext()
in C:\Users\PC\source\repos\v.0.0.01\v.0.0.01\Browser.cs:line 69
Here is my code:
using System;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace v.0._0._01
{
public static class WebBrowserExtensions
{
public static Task<Uri> DocumentCompletedAsync(this WebBrowser wb)
{
var tcs = new TaskCompletionSource<Uri>();
WebBrowserDocumentCompletedEventHandler handler = null;
handler = (_, e) =>
{
wb.DocumentCompleted -= handler;
tcs.TrySetResult(e.Url);
};
wb.DocumentCompleted += handler;
return tcs.Task;
}
}
public partial class Browser : Form
{
public Browser()
{
InitializeComponent();
}
private async void button7_Click(object sender, EventArgs e)
{
webBrowser1.Navigate("https://company.crm4.dynamics.com/main.aspx?app=d365default&pagetype=entitylist&etn=opportunity");
await webBrowser1.DocumentCompletedAsync(); // async magic
HtmlElement fbLink = webBrowser1.Document.GetElementById("shell-container").Document.GetElementById("mainContent").Document.GetElementById("quickFind_button_0"); ;
fbLink.InvokeMember("click");
}
}
}
Also now I have noticed that quickFind_text_0 and quickFind_button_0 always starts with same words but numbers are changing like quickFind_text_1 and quickFind_button_1 or quickFind_text_2 and quickFind_button_2. However by manual clicking everything works with quickFind_text_0 and quickFind_button_0.

Here is an extension method for easy awaiting of the DocumentCompleted event:
public static class WebBrowserExtensions
{
public static Task<Uri> DocumentCompletedAsync(this WebBrowser wb)
{
var tcs = new TaskCompletionSource<Uri>();
WebBrowserDocumentCompletedEventHandler handler = null;
handler = (_, e) =>
{
wb.DocumentCompleted -= handler;
tcs.TrySetResult(e.Url);
};
wb.DocumentCompleted += handler;
return tcs.Task;
}
}
It can be used like this:
private async void button1_Click(object sender, EventArgs e)
{
webBrowser1.Navigate("https://company.crm4.dynamics.com/main.aspx");
await webBrowser1.DocumentCompletedAsync(); // async magic
HtmlElement fbLink = webBrowser1.Document.GetElementById("quickFind_button_0");
fbLink.InvokeMember("click");
}
The lines after the await will run after the page has completed loading.
Update: Here is another extension method for awaiting a specific element to appear in the page:
public static async Task<HtmlElement> WaitForElementAsync(this WebBrowser wb,
string elementId, int timeout = 30000, int interval = 500)
{
var stopwatch = Stopwatch.StartNew();
while (true)
{
try
{
var element = wb.Document.GetElementById(elementId);
if (element != null) return element;
}
catch { }
if (stopwatch.ElapsedMilliseconds > timeout) throw new TimeoutException();
await Task.Delay(interval);
}
}
It can be used for example after invoking a click event that modifies the page using XMLHttpRequest:
someButton.InvokeMember("click");
var mainContentElement = await webBrowser1.WaitForElementAsync("mainContent", 5000);

C# Emgucv turn off webcam

currently my program can open the webcam then dynamic capture the human face, however, I have no idea how to stop the camera because it will keep capturing the face even the windows are closed.
private static VideoCapture _cameraCapture;
public VideoSurveilance()
{
InitializeComponent();
Run();
}
void Run()
{
try
{
_cameraCapture = new VideoCapture();
}
catch (Exception e)
{
MessageBox.Show(e.Message);
return;
}
_fgDetector = new
Emgu.CV.VideoSurveillance.BackgroundSubtractorMOG2();
_blobDetector = new CvBlobDetector();
_tracker = new CvTracks();
Application.Idle += ProcessFrame;
}
private void btnStopCamera_Click(object sender, EventArgs e)
{
_cameraCapture.Pause();//not working
_cameraCapture.Stop();//not working
_cameraCapture.Dispose();//worked but crashed due to memory issue
this.Close();
faceManipulate fm = new faceManipulate();
fm.Show();
Memory issue already solved. However, Dispose will cause the process frame Null Reference Object.
void ProcessFrame(object sender, EventArgs e)
{
Mat frame = _cameraCapture.QueryFrame();
Mat smoothedFrame = new Mat();
CvInvoke.GaussianBlur(frame, smoothedFrame, new Size(3, 3), 1);
}

You already solved the issue, you should call the Dispose method.
CameraCapture implements DisposableObject, you should not have it as a static variable, instead you should keep it as a variable and dispose when you are done with it.
I saw that you said that it "worked but crashed due to memory issue", if this is still a problem post a question or comment below describing the memory issue.

I noticed this code challenge is old and not many solutions have been posted at this time. However, the provided response will not really solve the issue. I encountered the same problem and found a way around it to avoid the memory NullReferenceError. I will use my own code here for convenience, but the challenges are the same, so it applies. Pick the code section that applies to your instance.
MY OBSERVATIONS
Any Bitmap object has to be disposed (bitmap.Dispose())
properly to free the memory from overload. The natural garbage
collector seems not to pick it up at the end of its function.
The Emgu.CV.Capture _capture; object has to be disposed
(_capture.Dsipose()) as well but has to be done with boolean control to avoid a NullReference error.
public partial class Main : Form
{
bool isStreaming;
bool onCamera;
Capture _capture;
public Main()
{
InitializeComponent();
}
private void btnReset_Click(object sender, EventArgs e)
{
onCamera = false;
isStreaming = false;
if (_capture != null) _capture.Dispose();
if (picStream.Image != null) picStream.Image = null;
if (picCapture.Image != null) picCapture.Image = null;
}
private void btnStream_Click(object sender, EventArgs e)
{
try
{
onCamera = true;
if (_capture != null) _capture.Dispose();
_capture = new Capture();
labelStatus.Text = "Streaming...";
isStreaming = true;
StreamVideo();
Application.Idle += Streaming;
}
catch {}
}
private void Streaming(object sender, EventArgs e)
{
try
{
if(onCamera && isStreaming)
{
if (picStream.Image != null) picStream.Image = null;
var img = _capture.QueryFrame().ToImage<Bgr, byte>();
var bmp = img.Bitmap;
picStream.Image = bmp;
}
}
catch {}
}
private void btnCapture_Click(object sender, EventArgs e)
{
onCamera = true;
CaptureImage();
labelStatus.Text = "Captured!";
if (picCapture.Image != null) picCapture.Image = null;
picCapture.Image = picStream.Image;
}
private void btnLoadCamera_Click(object sender, EventArgs e)
{
try
{
if (!isStreaming)
{
_capture = new Capture();
StreamVideo();
pnlStatus.BackColor = Color.DimGray;
}
else
{
_capture.Dispose();
Application.Idle -= Streaming;
picStream.Visible = true;
picStream.Image = null;
picCapture.Visible = false;
picCapture.Image = null;
isStreaming = false;
pnlStatus.BackColor = Color.DimGray;
}
}
catch {}
}
}

How can i extract frames from video using directshowlib-2005?

With this code i can play video files from my hard disk and show the video in pictureBox1. But i wonder how can i save all the frames of the video to images files on the hard disk ? While playing the video or without playing i need somehow to extract the frames and save them.
This is my used code so far:
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
IGraphBuilder m_graphBuilder = null;
IMediaControl m_mediaCtrl = null;
IMediaEventEx m_mediaEvt = null;
IMediaPosition m_mediaPos = null;
IMediaSeeking m_mediaSeeking = null;
public Form1()
{
InitializeComponent();
}
void InitInterfaces()
{
try
{
m_graphBuilder = (IGraphBuilder)new FilterGraph();
m_mediaCtrl = (IMediaControl)m_graphBuilder;
m_mediaEvt = (IMediaEventEx)m_graphBuilder;
m_mediaPos = (IMediaPosition)m_graphBuilder;
m_mediaSeeking = (IMediaSeeking)m_graphBuilder;
}
catch (Exception)
{
MessageBox.Show("Couldn't start directshow graph");
}
}
void CloseInterfaces()
{
if (m_mediaCtrl != null)
{
m_mediaCtrl.StopWhenReady();
}
m_mediaCtrl = null;
m_mediaEvt = null;
m_mediaPos = null;
m_mediaSeeking = null;
if (m_graphBuilder != null)
Marshal.ReleaseComObject(this.m_graphBuilder);
m_graphBuilder = null;
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void SetuupVideoRenderer()
{
IBaseFilter vmrFilter = null;
vmrFilter = (IBaseFilter)new VideoMixingRenderer();
m_graphBuilder.AddFilter(vmrFilter, "Video Renderer");
IVMRFilterConfig FilterConfig = (IVMRFilterConfig)vmrFilter;
FilterConfig.SetRenderingMode(VMRMode.Windowless);
IVMRWindowlessControl windowlessCtrl = (IVMRWindowlessControl)vmrFilter;
windowlessCtrl.SetVideoClippingWindow(this.pictureBox1.Handle);
windowlessCtrl.SetVideoPosition(null, DsRect.FromRectangle(pictureBox1.ClientRectangle));
windowlessCtrl.SetAspectRatioMode(VMRAspectRatioMode.LetterBox);
}
private void buttonLoad_Click(object sender, EventArgs e)
{
openFileDialog1.Filter = "All Files (*.*)|*.*|mp4 (*.mp4)|*.mp4|mov (*.mov)|*.mov||";
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
CloseInterfaces();
InitInterfaces();
SetuupVideoRenderer();
m_graphBuilder.RenderFile(openFileDialog1.FileName, null);
textBoxDur.Text = ( getDuration() * 0.0000001).ToString();
m_mediaCtrl.Run();
timer1.Enabled = true;
}
}
private void GetPosition(out long CurrentPos,out long StopPos)
{
m_mediaSeeking.GetPositions(out CurrentPos, out StopPos);
}
private long getDuration()
{
long duration;
m_mediaSeeking.GetDuration(out duration);
return duration;
}
private void SetPos(double fPos)
{
DsLong startPosition = (DsLong)(10000000 * fPos);
m_mediaSeeking.SetPositions(startPosition, AMSeekingSeekingFlags.AbsolutePositioning, null, AMSeekingSeekingFlags.NoPositioning);
}
private void buttonPause_Click(object sender, EventArgs e)
{
m_mediaCtrl.Pause();
}
private void buttonPlay_Click(object sender, EventArgs e)
{
m_mediaCtrl.Run();
}
private void OnVideoCompleted()
{
MessageBox.Show("Video Playback Completed");
}
private void timer1_Tick(object sender, EventArgs e)
{
long iCurPos, iStopPos;
GetPosition(out iCurPos, out iStopPos);
if (iCurPos >= iStopPos)
{
timer1.Enabled = false;
OnVideoCompleted();
return;
}
textBoxCurPos.Text = (iCurPos * 0.0000001 ).ToString();
}
private void buttonGo_Click(object sender, EventArgs e)
{
SetPos(Convert.ToDouble(textBoxNewPos.Text));
timer1.Enabled = true;
}
}
}

I think this is excatly what you are looking for:
extract frames of a video
Have a look as well at this SO question and the links provided on this webpage.
The easiest way to do it is indeed using an FFMPEG, since its alredy includes some of the most common codecs (if you dont mind extra 30+Mb added to your app). As for wrappers, i used AForge wrapper in the past and really liked it, because of how simple it is to work with. Here is an example from its docs:
// create instance of video reader
VideoFileReader reader = new VideoFileReader();
// open video file
reader.Open( "test.avi");
// read 100 video frames out of it
for ( int i = 0; i < 100; i++)
{
Bitmap videoFrame = reader.ReadVideoFrame();
videoFrame.Save(i + ".bmp")
// dispose the frame when it is no longer required
videoFrame.Dispose( );
}
reader.Close();

Print Multiple Pages From a UWA

I have about 8 records that I want to print in one batch, each on a separate page. However, the UWP sample for this uses over 600 lines of code to accomplish it. It seems to me that it has to be much, much easier than that. I thought all we'd have to do is add each page to the PrintDocument and send the print job. Apparently not. I'm using this:
async void Print()
{
var printDocument = new PrintDocument();
var printDocumentSource = printDocument.DocumentSource;
var printMan = PrintManager.GetForCurrentView();
printMan.PrintTaskRequested += PrintTaskRequested;
var pages = new List<Page>();
foreach (var item in items)
{
(//Set up variables)
var printPage = new PageToPrint() { //Set properties };
printPage.Set_Up(); //Set up fields
pages.Add(printPage);
}
printDocument.SetPreviewPage(1, page);
printDocument.SetPreviewPageCount(pages.Count, PreviewPageCountType.Final);
foreach (var page in pages)
{
printDocument.AddPage(page);
}
printDocument.AddPagesComplete();
await PrintManager.ShowPrintUIAsync();
}
void PrintTaskRequested(PrintManager sender, PrintTaskRequestedEventArgs e)
{
PrintTask printTask = null;
printTask = e.Request.CreatePrintTask("Kimble Print Job", sourceRequested =>
{
printTask.Completed += PrintTask_Completed;
sourceRequested.SetSource(printDocumentSource);
});
}
private async void PrintTask_Completed(PrintTask sender, PrintTaskCompletedEventArgs args)
{
await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
PrintManager printMan = PrintManager.GetForCurrentView();
printMan.PrintTaskRequested -= PrintTaskRequested;
});
}
However, it won't generate the print preview. It just sits there spinning and spinning, and if I hit "print" it doesn't succeed (PDF can't open, job never gets to a physical printer.)
I was hoping printing would be at least reasonably easy with the PrintDocument, and I still think it looks like it should be. Am I just missing it here, or does it really take 600+ lines of code to dispatch a simple print job?

However, it won't generate the print preview.
This is because the setPreview method printDocument.SetPreviewPage(1, page); must be put in printDocument.GetPreviewPageevent handle. So you should register the event handle firstly. Same with printDocument.AddPages event handle.You messed up the event handle register and callback function all in one.Here I do a little change of your code and I tested it works well.
protected PrintDocument printDocument;
protected IPrintDocumentSource printDocumentSource;
List<Page> pages = new List<Page>();
Page printPage = new PageToPrint();
public MainPage()
{
this.InitializeComponent();
RegisterForPrinting();
}
private async void BtnPrint_Click(object sender, RoutedEventArgs e)
{
await PrintManager.ShowPrintUIAsync();
}
public void RegisterForPrinting()
{
printDocument = new PrintDocument();
printDocumentSource = printDocument.DocumentSource;
pages.Add(printPage);
printDocument.GetPreviewPage += GetPrintPreviewPage;
printDocument.AddPages += AddPrintPages;
PrintManager printMan = PrintManager.GetForCurrentView();
printMan.PrintTaskRequested += PrintTaskRequested;
}
private void AddPrintPages(object sender, AddPagesEventArgs e)
{
foreach (var page in pages)
{
printDocument.AddPage(page);
}
printDocument.AddPagesComplete();
}
private void GetPrintPreviewPage(object sender, GetPreviewPageEventArgs e)
{
printDocument.SetPreviewPage(1, printPage);
printDocument.SetPreviewPageCount(pages.Count, PreviewPageCountType.Final);
}
void PrintTaskRequested(PrintManager sender, PrintTaskRequestedEventArgs e)
{
PrintTask printTask = null;
printTask = e.Request.CreatePrintTask("Kimble Print Job", sourceRequested =>
{
printTask.Completed += PrintTask_Completed;
sourceRequested.SetSource(printDocumentSource);
});
}
private async void PrintTask_Completed(PrintTask sender, PrintTaskCompletedEventArgs args)
{
await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
PrintManager printMan = PrintManager.GetForCurrentView();
printMan.PrintTaskRequested -= PrintTaskRequested;
});
}
Although you may not need all the code of the sample, but I recommend you to follow the official sample structure and build a PrintHelper class.

Why this application is taking so much of memory?

So my problem is, i created one app for my personal use which fetch the html pages from some sites and then display it in a web browser after some alteration. Every thing is working fine but what perturbed me is the memory that it is taking. After querying for 3-4 terms, memory usage reaches to approximate 300-400 mb.
Some relevant code from the app is
void sentenceBox_Navigated(object sender, WebBrowserNavigatedEventArgs e)
{
GC.Collect();
}
HtmlDocument hd;
Word w=new Word();
private void button1_Click(object sender, EventArgs e)
{
button1.Enabled = false;
status.Text = "Processing english req..";
if (checkInHis(queryTxt.Text))
{
sentenceBox.AllowNavigation = true;
richTextBox1.Text = w.engDefinition;
sentenceBox.DocumentText = w.engDefinition;
status.Text = "Word found in History.DONE!";
button1.Enabled = true;
return;
}
if (w == null || w.engWordProp != queryTxt.Text)
{
w.engWordProp=queryTxt.Text;
w.loadEngDefn();
w.engDefnLoadedEvent += new Word.engDefnLoaded(w_engDefnLoadedEvent);
return;
}
w.loadEngDefn();
w.engDefnLoadedEvent += new Word.engDefnLoaded(w_engDefnLoadedEvent);
}
void w_engDefnLoadedEvent(Word sender, EventArgs data)
{
sentenceBox.AllowNavigation = true;
sentenceBox.DocumentText = sender.engDefinition;
sender.engDefnLoadedEvent -= w_engDefnLoadedEvent;
button1.Enabled = true;
}
private void addToHistory(Word w)
{
status.Text = "Saving offline...";
if (!checkInHis(w.engWordProp))
{
history.Add(w);
// label1.Text = w.engWordProp + " saved in localdb. Database size: " + history.Count;
w = null;
}
else
{
// label1.Text = w.engWordProp + " Skipped. Database size: " + history.Count;
}
}
private Boolean checkInHis(string p)
{
status.Text = "checking offline storage...";
foreach (Word item in history)
{
if (item.engWordProp == p)
{
status.Text = "Word found in history.";
w = item;
return true;
}
}
status.Text = "Not found in offline database...";
return false;
}
private void sentenceBox_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
((WebBrowser)sender).AllowNavigation = false;
}
private void button2_Click_1(object sender, EventArgs e)
{
button2.Enabled = false;
status.Text = "Requesting hindi definition...";
if (checkInHis(queryTxt.Text))
{
sentenceBox.AllowNavigation = true;
sentenceBox.DocumentText = w.hindiDef;
status.Text = "DONE!";
button2.Enabled = true;
return;
}
if (w == null || w.engWordProp != queryTxt.Text)
{
w.engWordProp=queryTxt.Text;
w.loadHinDefn();
w.HindiDefLoadedEvent += new Word.hindiDefLoaded(w_HindiDefLoadedEvent);
return;
}
w.loadHinDefn();
w.HindiDefLoadedEvent += new Word.hindiDefLoaded(w_HindiDefLoadedEvent);
}
void w_HindiDefLoadedEvent(Word sender, EventArgs data)
{
sentenceBox.AllowNavigation = true;
sentenceBox.DocumentText = sender.hindiDef;
button2.Enabled = true;
sender.HindiDefLoadedEvent -= w_HindiDefLoadedEvent;
}
private void button3_Click(object sender, EventArgs e)
{
button3.Enabled = false;
saveWord(w);
button3.Enabled = true;
}
private void saveWord(Word w)
{
if (w.hindiDef == "")
{
w.loadHinDefn();
w.HindiDefLoadedEvent += new Word.hindiDefLoaded(w_HindiDefLoadedEventforHindiSave);
}
if (w.engDefinition == "")
{
w.loadEngDefn();
w.engDefnLoadedEvent += new Word.engDefnLoaded(w_engDefnLoadedEventforEnglishSave);
}
addToHistory(w);
}
void w_HindiDefLoadedEventforHindiSave(Word sender, EventArgs data)
{
sender.HindiDefLoadedEvent -= w_HindiDefLoadedEvent1;
sender.HindiDefLoadedEvent -= w_HindiDefLoadedEventforHindiSave;
}
void w_engDefnLoadedEventforEnglishSave(Word sender, EventArgs data)
{
sender.engDefnLoadedEvent -= w_engDefnLoadedEventforEnglishSave;
sender.engDefnLoadedEvent -= w_engDefnLoadedEventforEnglishSave;
}
void w_HindiDefLoadedEvent1(Word sender, EventArgs data)
{
saveWord(sender);
sender.HindiDefLoadedEvent -= w_HindiDefLoadedEvent1;
}
void w_engDefnLoadedEvent1(Word sender, EventArgs data)
{
sender.loadHinDefn();
sender.HindiDefLoadedEvent += new Word.hindiDefLoaded(w_HindiDefLoadedEvent1);
sender.engDefnLoadedEvent -= w_engDefnLoadedEvent1;
}
void initWord(String query)
{
queryTxt.Text = query;
w.engWordProp=queryTxt.Text;
w.loadEngDefn();
w.loadHinDefn();
w.engDefnLoadedEvent += new Word.engDefnLoaded(w_engDefnLoadedEvent);
w.HindiDefLoadedEvent += new Word.hindiDefLoaded(w_HindiDefLoadedEvent);
}
Word class
public Word(string q)
{
wb1 = new WebBrowser();
wb2=new WebBrowser();
engWord = q;
hindiDef = "";
engDefinition = "";
flagE = false;
flagH = false;
engUrl = "http://oxforddictionaries.com/definition/english/" + q + "?q=" + q;
hindiUrl = "http://dict.hinkhoj.com/hindi-dictionary.php?word=" + q;
wb1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(wb_DocumentCompleted); ;
wb2.DocumentCompleted+=new WebBrowserDocumentCompletedEventHandler(wb_DocumentCompleted);
}
public delegate void engDefnLoaded(Word sender, EventArgs data);
public event engDefnLoaded engDefnLoadedEvent;
protected void onEngDefnLoadCompleated(Word sender, EventArgs data)
{
if (engDefnLoadedEvent!=null)
{
engDefnLoadedEvent(this,data);
}
}
public void loadEngDefn()
{
if (this.engDefinition=="")
{
// wb1 = new WebBrowser();
wb1.ScriptErrorsSuppressed = true;
wb1.Url = new Uri(this.engUrl);
}
else
{
if (engDefnLoadedEvent!=null)
{
engDefnLoadedEvent(this, new EventArgs());
}
}
}
public void loadHinDefn() {
if (this.hindiDef=="")
{
// wb2 = new WebBrowser();
wb2.ScriptErrorsSuppressed = true;
wb2.Url = new Uri(this.hindiUrl);
}
else
{
if (HindiDefLoadedEvent!=null)
{
HindiDefLoadedEvent(this, new EventArgs());
}
}
}
[NonSerialized]
HtmlDocument hd;
void wb_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
if (((WebBrowser)sender).ReadyState == WebBrowserReadyState.Complete)
{
hd = ((WebBrowser)sender).Document;
if (e.Url.ToString() == this.hindiUrl)
{
parsePage(hd.GetElementById("maint"), "hindi");
((WebBrowser)sender).DocumentCompleted -= wb_DocumentCompleted;
sender = null;
}
else
{
parsePage(hd.GetElementById("entryPageContent"), "eng");
((WebBrowser)sender).DocumentCompleted -= wb_DocumentCompleted;
sender = null;
}
}
}
private void parsePage(HtmlElement hd, string lan)
{
HtmlElementCollection he;
if (lan == "eng")
{
he = hd.GetElementsByTagName("section");
foreach (HtmlElement item in he)
{
this.engDefinition += item.InnerHtml + "<br>";
}
flagE = true;
engDefnLoadedEvent(this, new EventArgs());
wb1 = null;
wb1.Dispose();
return;
}
else
{
he = hd.GetElementsByTagName("div");
foreach (HtmlElement item in he)
{
if (item.GetAttribute("itemprop") == "itemListElement")
{
this.hindiDef += item.GetElementsByTagName("div")[0].InnerHtml + "<br>";
}
}
flagH = true;
HindiDefLoadedEvent(this,new EventArgs());
wb2 = null;
wb2.Dispose();
return;
}
}
Question: How to remove this memory leak issue ?
sample pic
After query 25 words.

First I'd like to point out that just because your application uses 300 - 400 MB of memory doesn't necessarily mean that you have a memory leak. Only if the memory keeps increasing with each requested page and is never released do you have a leak.
Second, in order to diagnose the problem you need to run a memory profiler. If you are using the Premium or Ultimate edition of Visual Studio, it has a memory profile feature. If not you can use either RedGate Memory Profile (14-day free trial) or similar software.
I would also add that the most common cause for leaks in .NET is the use of events where a short lived object attaches itself as an observer/handler to an event raised by a long lived object.

Well in the constructor of your Word class you have the following code:
wb1 = new WebBrowser();
wb2=new WebBrowser();
The WebBrowser class does is to instantiate some of the web browsing features of your local IE version.My guess is that WebBrowser being a part of the IE it has a high memory consumption.So imagine that you instantiate 2 WebBrowser objects for each word that you have.You could use a pool system for your WebBrowser objects, but i would replace the behavior of those with an WebClient object which is disposable.
P.S. The Garbage Collector system is a fine tuned system using GC.Collect(); it's like using a sledgehammer on your code.