I have a WPF application with a very complex XAMLs, I need a way to know the point that my application hang on, when I try to pause the execution, the application seems to not be hanging, the pointer will be on this line:

```
System.Windows.Application myApp;
.
.
.
.
myApp.Run(); // <== this line

```

This is happening when I change the layout of the task bar or when windows explorer crashed (the task bar is hidden), if I do those changes in a heavy repetition, the application will never recover, but when a small change done, the application will recover after minutes, I need to know the cause of this issue, I doubt in the complex XAMLs of my application, but I need a way to know the page or the component, or the whatever the source of this hang.

**\* EDIT \***

I need a tool or a way to know what is the XAML that consuming the dispatcher time!

**\* EDIT \***

I have got the exact reason of the hang, it is because of creating an instance of ReportViewer in another thread, When I removed the creation of the instance, It worked perfectly, the strange thing, that this mistake is existed in my application long time ago, but the hang has raised recently, I mean: my application will hang when you insert one of these codes in any location of my application:

```
        new Action(() =>
        {
            ReportViewer rv = new ReportViewer();
        }).BeginInvoke(null, null);

```

OR

```
        new Action(() =>
        {
            ReportViewer rv = new ReportViewer();
            rv.Dispose();
        }).BeginInvoke(null, null);

```

OR

```
        new Action(() =>
        {
            ReportViewer rv = new ReportViewer();
            rv.LocalReport.ReleaseSandboxAppDomain();
            rv.Dispose();
        }).BeginInvoke(null, null);

```

My questions:

1- What is the relation between changing the layout of windows (Resizing the task bar or moving it) and the report viewer which is not added to any visual tree, why this cause my application to hang??

2- How I can determine the location of the hang?

3- Some times the application will recover in few minutes (3-5), but some times the hang still for hours and the application will not recover, Why?

4- How I can I determine the component or configuration that caused my application to hang in this circumstances?

By the way, this is a very useful for the others if solved, We have spent very huge time to detect it, but didn't got the exact reason combined with the ReportViewer that causing the hang!