The `TabControl.SelectionChanged` is the same event as a `ComboBox.SelectionChanged`

It originates from [`Selector.SelectionChanged`][1].

So, if you do not mark your event as handled in your event handler, it will bubble up the tree, and eventually arrive at your `TabControl`, which is causing this &quot;firing too often&quot; issue.

Mark your event as handled in your SelectionChanged of your `ComboBox`/`ListBox`/`ListView`/any other Selector you use in your DataGrid like so:

    private void MyComboBox_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        e.Handled = true;
    }

And this inconvenience will go away ;).

  [1]: http://msdn.microsoft.com/en-us/library/system.windows.controls.primitives.selector.selectionchanged.aspx

&lt;pre&gt;
     private void tabControlName_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (e.Source is TabControl) //if this event fired from TabControl then enter
            {
                if (tabItemName.IsSelected)
                {
                    //Do your job here
                }
            }
        }
&lt;/pre&gt;

If you have added a handler with AddHandler in a parent element, all selection changes will fire the SelectionChanged-event. In this case, you can give your TabControl a name and then check in the EventHandler if the name of the OriginalSource is the name of your TabControl.

Another good approch is adding a handler to the tabControl.Items.SelectionChanged:

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
      ItemCollection view = tabControl.Items;
      view.CurrentChanged += new EventHandler(view_CurrentChanged);
    }

    void view_CurrentChanged(object sender, EventArgs e)
    {
      throw new NotImplementedException();
    }

Maybe is not the xamly way, but is less pain as it only fires when an item is changed.

I know that `mysql_escape_string` is deprecated from 5.3 but what was the actual difference in `mysql_real_escape_string`.

What I thought was that `mysql_real_escape_string` is the exact same as `mysql_escape_string` apart from `mysql_real_escape_string` takes a second argument for the mysql resource.

So then I thought well surely there must be some difference as to how strings are handled because there would not be a need for 2 functions.

So then I thought that the difference was purely down to locale and character encodings?


mysql_escape_string VS mysql_real_escape_string

I just know that the non-primitives (the objects) go on the heap, and methods go on the stack, but what about the primitive variables?

**--update**

Based on the answers, I could say the heap can have a new stack and heap for a given object? Given that the object will have primitive and reference variables..?

Do Java primitives go on the Stack or the Heap?

I have a tabbed GUI with each tab containing a Frame. In one of these Frames there is a DataGrid. When the user selects this tab, I need my datagrid sorted, so I&#39;m using the TabControl SelectionChanged event to trigger the sort. However, this event triggers every time an item is selected from the DataGrid, even though the tabs themselves remain untouched.

I&#39;ve tried number of different events:
GotFocus for a TabItem
RequestBringIntoView for a TabItem

but they all seem to suffer from this problem. What is causing this?

In C# WPF, why is my TabControl&#39;s SelectionChanged event firing too often?

I have a tabbed GUI with each tab containing a Frame. In one of these Frames there is a DataGrid. When the user selects this tab, I need my datagrid sorted, so I'm using the TabControl SelectionChanged event to trigger the sort. However, this event triggers every time an item is selected from the DataGrid, even though the tabs themselves remain untouched.
I've tried number of different events:
GotFocus for a TabItem
RequestBringIntoView for a TabItem
but they all seem to suffer from this problem. What is causing this?

It seems that the C# 3.0 object initializer syntax allows one to exclude the open/close pair of parentheses in the constructor when there is a parameterless constructor existing. Example:

    var x = new XTypeName { PropA = value, PropB = value };

As opposed to:

    var x = new XTypeName() { PropA = value, PropB = value };

I&#39;m curious why the constructor open/close parentheses pair is optional here after `XTypeName`?

Why are C# 3.0 object initializer constructor parentheses optional?

There is a whole wealth of reflection examples out there that allow you to get either:
&lt;ul&gt;
&lt;p&gt;1. All properties in a class&lt;/p&gt;
&lt;p&gt;2. A single property, provided you know the string name&lt;/p&gt;
&lt;/ul&gt;

Is there a way (using reflection, TypeDescriptor, or otherwise) to get the string name of a property in a class at runtime, provided all I have is an instance of the class and property?


**EDIT**
I know that I can easily get all the properties in a class using reflection and then get the name of each property.  What I&#39;m asking for is a function to give me name of a property, provided I pass it the instance of the property.  In other words, how do I find the property I want from the PropertyInfo[] array returned to me from the class.GetType().GetProperty(myProperty) so that I can get the PropertyInfo.Name from it?

Get string name of property using reflection

What is the proper way to convert a `char` to `int`?
This gives `49`:

    int val = Convert.ToInt32(&#39;1&#39;);
    //int val = Int32.Parse(&quot;1&quot;); // Works

I don&#39;t want to convert to string and then parse it.


How to convert char to int?

I have a CheckedListBox where I want an event _after_ an item is checked so that I can use CheckedItems with the new state.

Since ItemChecked is fired before CheckedItems is updated it won&#39;t work out of the box.

What kind of method or event can I use to be notified when the CheckedItems is updated?

Which CheckedListBox event triggers after a item is checked?

Yet another list-comparing question.

    List&lt;MyType&gt; list1;
    List&lt;MyType&gt; list2;

I need to check that they both have the same elements, regardless of their position within the list. Each **MyType** object may appear multiple times on a list. Is there a built-in function that checks this? What if I guarantee that each element appears only once in a list?


**EDIT:** Guys thanks for the answers but I forgot to add something, the number of occurrences of each element should be the same on both lists.

Compare two List&lt;T&gt; objects for equality, ignoring order

I&#39;d like to handle the `Closing` event (when a user clicks the upper right &#39;X&#39; button) of my window in order to eventually display a confirm message or/and cancel the closing.

I know how to do this in the code-behind: subscribe to the `Closing` event of the window then use the `CancelEventArgs.Cancel` property.
 
But I&#39;m using MVVM so I&#39;m not sure it&#39;s the good approach.

I think the good approach would be to bind the `Closing` event to a `Command` in my ViewModel.

I tried that:

    &lt;i:Interaction.Triggers&gt;
        &lt;i:EventTrigger EventName=&quot;Closing&quot;&gt;
            &lt;cmd:EventToCommand Command=&quot;{Binding CloseCommand}&quot; /&gt;
        &lt;/i:EventTrigger&gt;
    &lt;/i:Interaction.Triggers&gt;

With an associated `RelayCommand` in my ViewModel but it doesn&#39;t work (the command&#39;s code is not executed).

Handling the window closing event with WPF / MVVM Light Toolkit

Is there any way to force the WPF designer to reload or refresh, without rebuilding the entire project or solution?

If there&#39;s an error, I get an option in the designer view to refresh the designer. But if I don&#39;t have an error, how can I get the designer to refresh after I&#39;ve made a change?


How to manually reload the Visual Studio designer for WPF

I have a `TextBox` control within a `StackPanel` whose `Orientation` is set to `Horizontal`, but can&#39;t get the TextBox to fill the remaining StackPanel space.

XAML:


    &lt;Window x:Class=&quot;WpfApplication1.MainWindow&quot;
            xmlns=&quot;http://schemas.microsoft.com/winfx/2006/xaml/presentation&quot;
            xmlns:x=&quot;http://schemas.microsoft.com/winfx/2006/xaml&quot;
            Height=&quot;180&quot; Width=&quot;324&quot;&gt;

        &lt;StackPanel Background=&quot;Orange&quot; Orientation=&quot;Horizontal&quot; &gt;
            &lt;TextBlock Text=&quot;a label&quot; Margin=&quot;5&quot; VerticalAlignment=&quot;Center&quot;/&gt;
            &lt;TextBox Height=&quot;25&quot; HorizontalAlignment=&quot;Stretch&quot; Width=&quot;Auto&quot;/&gt;
        &lt;/StackPanel&gt;
    &lt;/Window&gt;

And this is what it looks like:

![alt text][1]

Why is that TextBox not filling the StackPanel?

I know I can have more control by using a `Grid` control, I&#39;m just confused about the layout.

  [1]: http://i.stack.imgur.com/kSeqt.png

WPF TextBox won&#39;t fill in StackPanel

I have editable combobox where not always the preferred item is in the drop-down list. 

I would like to have the possibility of manually entering text in the textbox which is propagated to the string bound to SelectedValue.

Right now the string bound to SelectedValue is only updated if the entered value is on of the ones in the ComboBox items.

How do I allow custom values not available in the ComboBox list to be manually entered and properly propagated to bound value?

Editable ComboBox with binding to value not in list

I have two Grids inside a Stackpanel.
The first grid is named as GridX.
Initially, inside the grid, there is a 2D array of Textboxes(RowDefs/ColumnDefs).
The TextBox definition in XAML is

    &lt;TextBox x:Name=&quot;A1&quot; Grid.Row=&quot;4&quot; Grid.Column=&quot;5&quot; TextAlignment=&quot;Center&quot; /&gt;


I want to add a **TextBlock** programmatically in the same position as part of GridX.

The effect must be like this

    &lt;TextBlock Grid.Row=&quot;4&quot; Grid.Column=&quot;5&quot;
    HorizontalAlignment=&quot;Left&quot; VerticalAlignment=&quot;Top&quot; Text=&quot;10&quot; FontSize=&quot;8&quot;/&gt;

How to add this.
I have tried this:

    TextBlock tblock = new TextBlock();
    GridX.SetColumn(tblock, cIndex);
    GridX.SetRow(tblock, rIndex);

But failed.

Again I tried this:

    int rIndex = Grid.GetRow(txtBox);
    int cIndex = Grid.GetColumn(txtBox);                               
    
    TextBlock tblock = new TextBlock();
    tblock.VerticalAlignment = VerticalAlignment.Top;
    tblock.HorizontalAlignment = HorizontalAlignment.Left;
    tblock.FontSize = 8;
    tblock.Text = rc[i, j - 1];
                                
    Grid.SetColumn(tblock, cIndex);
    Grid.SetRow(tblock, rIndex);
                                
    txtBox.MaxLength = 1;    

Now the problem is that TextBlock is not visible. TextBox hides it.
I appreciate your help.                       
                                

How to set Grid row and column positions programmatically

I am using TabControl in #.NET application. By default first tab page of TabControl is showing in form loading. I want to activate/show other tab pages in form loading. Programmatically, how can I show other tab page?

Activate tabpage of TabControl

How to build vertical tab sets in WPF? The tabs will stack up in top-to-bottom just like the &quot;Properties&quot; of a project shown in visual studio.

How to build vertical tab sets in WPF?

Basically I have in my MainViewModel.cs:

    ObservableCollection&lt;TabItem&gt; MyTabs { get; private set; }

However, I need to somehow be able to not only create the tabs, but have the tabs content be loaded and linked to their appropriate viewmodels while maintaining MVVM.

Basically, how can I get a usercontrol to be loaded as the content of a tabitem AND have that usercontrol wired up to an appropriate viewmodel. The part that makes this difficult is the ViewModel is not supposed to construct the actual view items, right? Or can it?

Basically, would this be MVVM appropriate:

    UserControl address = new AddressControl();
    NotificationObject vm = new AddressViewModel();
    address.DataContext = vm;
    MyTabs[0] = new TabItem()
    {
        Content = address;
    }

I only ask because well, i&#39;m constructing a View (AddressControl) from within a ViewModel, which to me sounds like a MVVM no-no.

How do I bind a TabControl to a collection of ViewModels?

I am developing a  Windows Form Application with several pages.  I am using a TabControl to implement this. Instead of using the header to switch between tabs, I want my application to control this e.g.  the next tab should open after the user has filled in a text box and clicked the next button.


Hide Tab Header on C# TabControl

I am making an event to check if specific tab page in a tab control is active.

The point is, it will trigger an event if that tab page in a tab control is the currently selected tab. Any code that will give me what I need?

Content Type	Original Author	Original Content on Stackoverflow
Question	Anders	View Question on Stackoverflow
Solution 1 - C#	Arcturus	View Answer on Stackoverflow
Solution 2 - C#	Towhid	View Answer on Stackoverflow
Solution 3 - C#	HCL	View Answer on Stackoverflow
Solution 4 - C#	Shimmy Weitzhandler	View Answer on Stackoverflow

In C# WPF, why is my TabControl's SelectionChanged event firing too often?

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

Solution 4 - C#

Do Java primitives go on the Stack or the Heap?

mysql_escape_string VS mysql_real_escape_string

Attributions