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Rotate image inside a button UWP

I'm trying to rotate a font icon inside a button 90° in the first click and back to 0° on the second click.
Currently I have:
<Page.Resources>
<Storyboard x:Name="RotateButton90Degrees">
<DoubleAnimation
EnableDependentAnimation="True"
Storyboard.TargetName="ShowSubTasks_ButtonRotateTransform"
Storyboard.TargetProperty="Angle"
From="0"
To="90"
Duration="350" />
</Storyboard>
</Page.Resources>
<Button
x:Name="ShowSubTasks_Button"
Background="Transparent">
<interactivity:Interaction.Behaviors>
<core:EventTriggerBehavior EventName="Click">
<media:ControlStoryboardAction Storyboard="{StaticResource RotateButton90Degrees}" />
</core:EventTriggerBehavior>
</interactivity:Interaction.Behaviors>
<FontIcon
FontFamily="Segoe MDL2 Assets"
Glyph=""
RenderTransformOrigin="0.5, 0.5">
<FontIcon.RenderTransform>
<RotateTransform x:Name="ShowSubTasks_ButtonRotateTransform" />
</FontIcon.RenderTransform>
</FontIcon>
</Button>
The problem is that the app crashes when I click the button (it's not finding the ShowSubTasks_ButtonRotateTransform). The second is that I don't know how to revert the rotation effect after the first click (first click -> 90°, second click -> 0°, third click -> 90° and so on).
Any help would be appreciated.

Ok i got the problem, the thing is that im running all that code inside a DataTemplate ... So that explains why its crashing. For the fix i used what #Dishant suggested, created two storyboards and with a DataTriggerBehavior i change the angle of the rotate transform
<StackPanel.Resources>
<Storyboard x:Name="RotateButtonTo90Degrees">
<DoubleAnimation
EnableDependentAnimation="True"
Storyboard.TargetName="ShowSubTasks_ButtonRotateTransform"
Storyboard.TargetProperty="Angle"
From="0"
To="90"
Duration="0:0:0.1" />
</Storyboard>
<Storyboard x:Name="RotateButtonTo0Degrees">
<DoubleAnimation
EnableDependentAnimation="True"
Storyboard.TargetName="ShowSubTasks_ButtonRotateTransform"
Storyboard.TargetProperty="Angle"
From="90"
To="0"
Duration="0:0:0.1" />
</Storyboard>
</StackPanel.Resources>
<Button
Background="Transparent"
Visibility="{Binding HasSubTasks, Mode=OneWay, Converter={StaticResource BoolToVisibilityConverter}}">
<interactivity:Interaction.Behaviors>
<core:DataTriggerBehavior Binding="{Binding ShowSubTasks, Mode=OneWay}" Value="True">
<media:ControlStoryboardAction Storyboard="{StaticResource RotateButtonTo90Degrees}" />
</core:DataTriggerBehavior>
<core:DataTriggerBehavior Binding="{Binding ShowSubTasks, Mode=OneWay}" Value="False">
<media:ControlStoryboardAction Storyboard="{StaticResource RotateButtonTo0Degrees}" />
</core:DataTriggerBehavior>
</interactivity:Interaction.Behaviors>
<FontIcon
FontFamily="Segoe MDL2 Assets"
Glyph=""
RenderTransformOrigin="0.5, 0.5">
<FontIcon.RenderTransform>
<RotateTransform x:Name="ShowSubTasks_ButtonRotateTransform" />
</FontIcon.RenderTransform>
</FontIcon>
</Button>
Also as #MartinZikmund suggested, i needed to change the duration from 350 to something like 0:0:0.5

In my case the app does not crash, but the icon does not rotate, because the duration is set to 350, which basically means 350 hours. If you change this value to something like 0:0:0.5, it should rotate in 0.5 seconds. To do the reverse animation, you would probably need to set the animation target programatically, but in such case you could just run the storyboard itself in the Click event handler.
If you are targeting Windows 10 15063 or higher, you can use Implicit Animations in XAML. In that case you could set up an implicit animation on the rotation of the icon and then just set the rotation property in the code-behind accordingly and implicit animation would take care of the animation itself.

WPF: add blur effect on button when mouse is on that button-MouseEnter

I'm trying to make a simple animation - when mouse cursor is on button I want to add blur effect on that button.
So far I have this.:
<Button x:Name="button_Copy" Content="Leaderboard" HorizontalAlignment="Left" Margin="311,217,0,0" VerticalAlignment="Top" Width="139" Height="34" Background="{x:Null}" BorderBrush="{x:Null}" FontSize="22" FontWeight="Bold" Foreground="#FFE2DBDB" IsHitTestVisible="True" Click="button_Copy_Click">
<Button.Triggers>
<EventTrigger RoutedEvent="MouseEnter">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation From="10" To="0" Duration="0:0:0.1"
Storyboard.TargetName="blurEffect" Storyboard.TargetProperty="Radius"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Button.Triggers>
</Button>
Build is succesfull, but when I take cursor over that button program immediately crashes... Any idea how to fix this?

I see you probably took your example from here.
You are missing the object BlurEffect as shown within the TextBox item as below:
<TextBlock Name="TxtSample" TextAlignment="Center" VerticalAlignment="Center" HorizontalAlignment="Center" Text="This is a sample and first test freetext">
<TextBlock.Effect>
<BlurEffect Radius="10" x:Name="blurEffect"/>
</TextBlock.Effect>
</TextBlock>

WP8, DoubleAnimation - "Cannot resolve TargetName" exception

I want to create marquee effect in WP8 application.
To accomplish this I placed StackPanel inside ScrollViewer and I'm trying to use DoubleAnimation on TranslateTransform.X property.
Code:
<phone:PhoneApplicationPage.Resources>
<Storyboard x:Name="Scroll" RepeatBehavior="Forever" AutoReverse="True">
<DoubleAnimation From="0" To="100" Storyboard.TargetName="transform" Storyboard.TargetProperty="X" Duration="0:0:5" />
</Storyboard>
</phone:PhoneApplicationPage.Resources>
<Grid x:Name="LayoutRoot">
...
<ScrollViewer Height="80" VerticalScrollBarVisibility="Disabled" HorizontalScrollBarVisibility="Hidden">
<StackPanel Orientation="Horizontal">
<StackPanel.RenderTransform>
<TranslateTransform x:Name="transform" />
</StackPanel.RenderTransform>
<Image Source="/Assets/logo1.png"></Image>
<Image Source="/Assets/logo2.png"></Image>
<Image Source="/Assets/logo3.png"></Image>
<Image Source="/Assets/logo4.png"></Image>
<Image Source="/Assets/logo5.png"></Image>
</StackPanel>
</ScrollViewer>
</Grid>
Unfortunately when calling Scroll.Begin() from code-behind in page Loaded event handler I'm getting exception: System.InvalidOperationException: Cannot resolve TargetName transform.
What I'am doing wrong?
Animation runs when I place StackPanel directly in LayoutRoot but not when it's child of ScrollViewer.

I think the exception is explanatory. Like you apply storyboard on some UI element but there is no element named "transform" in your xaml to which this storyboard will be going to be applied.
so this property Storyboard.TargetName should be name of the UI element that has to be transformed.
In your case if you have to simply give your StackPanel a name say MyStackPanel and then put this name in place of transform in your storyboard code.
<StackPanel Orientation="Horizontal" Name="MyStackPanel">
<StackPanel.RenderTransform>
<TranslateTransform x:Name="transform" />
</StackPanel.RenderTransform>
...
You storyboard should be changedin this way..
<phone:PhoneApplicationPage.Resources>
<Storyboard x:Name="Scroll" RepeatBehavior="Forever" AutoReverse="True">
<DoubleAnimation From="0" To="100" Storyboard.TargetName="MyStackPanel" Storyboard.TargetProperty="X" Duration="0:0:5" />
</Storyboard>
</phone:PhoneApplicationPage.Resources>
Important :-It would be much better if you just use Blend for making a simple animation and then see how the animation code generated in the page Xaml. You will got all of your answers :)

Stopping a double animation

In my UserControl.Resources i have defined a Storyboard which triggers a DoubleAnimation to set the Opactiy.
<Storyboard AutoReverse="True" x:Key="BlinkingStoryBoard">
<DoubleAnimation Storyboard.TargetProperty="Opacity" To="0.1" Duration="0:0:2" RepeatBehavior="Forever"/>
</Storyboard>
This Storyboard is applied to a grid when the UserControl is loaded:
<Grid Name="ImagePlaceHolder">
<Rectangle Fill="#D52B1E" Width="75" Height="75"/>
<Image Source="pack://siteoforigin:,,,/Resources/Images/cross.png" Width="75" Height="75" RenderTransformOrigin="0.5, 0.5" x:Name="Cross"/>
<Grid.Triggers>
<EventTrigger RoutedEvent="UserControl.Loaded">
<BeginStoryboard Storyboard="{StaticResource BlinkingStoryBoard}"/>
</EventTrigger>
</Grid.Triggers>
</Grid>
From my code-behind I want to stop this animation, but I cant stop it!
((Storyboard)uc.FindResource("BlinkingStoryBoard")).Stop();
Any ideas?

Have a look at this reference.
The main idea is that you need to call the storyboard Stop method passing the container of the storyboard.
You should try replacing the stop call with this:
((Storyboard)uc.FindResource("BlinkingStoryBoard")).Stop(ImagePlaceHolder);
Also from the reference, it shows that you can name your BeginStoryboard, for example:
<BeginStoryboard Name="MyStoryboardStarter" Storyboard="{StaticResource BlinkingStoryBoard}"/>
Now in the code behind you can find your storyboard more easily and stop it like this:
MyStoryboardStarter.Storyboard.Stop(ImagePlaceHolder);
Hope this helps.

Perform Event Trigger on DataGrid for DragEnter causing XAML exception

I am working on a c# wpf project and I have run in to a problem relating to firing an trigger within the XAML.
What I am trying to achieve is when the drags a file into the grid, it should animate the background colour change but for some reason it keeps on throwing an exception as soon as I run the program. I am getting the following error:
'Provide value on
'System.Windows.Baml2006.TypeConverterMarkupExtension' threw an
exception.' Line number '9' and line position '14'.
Below is the XAML code
<UserControl x:Class="ReportReader.UserControls.ReportDragDropControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008">
<Grid AllowDrop="True" DragDrop.DragOver="Grid_DragOver"
DragDrop.DragEnter="Grid_DragEnter" DragDrop.Drop="Grid_Drop" DragDrop.DragLeave="Grid_DragLeave">
<Grid.Triggers>
<EventTrigger RoutedEvent="Grid.DragEnter">
<BeginStoryboard>
<Storyboard>
<ColorAnimation To="#cecece" Storyboard.TargetProperty="(Grid.BackgroundColor).(SolidColorBrush.Color)" FillBehavior="Stop" Duration="0.0.1" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Grid.Triggers>
<TextBlock Margin="12,12,20,12" Name="txtDragDropStatus" Text="Drag file here or use file menu to load your report" TextAlignment="Center" FontSize="30" FontWeight="Bold" TextWrapping="WrapWithOverflow" Width="835" HorizontalAlignment="Center" VerticalAlignment="Center" />
</Grid>
</UserControl>
Thanks for any help you can provide.

There are two errors in your XAML file -
BackgroundColor is not a Dependency Property, instead use Background.
0.0.1 is not a valid value for TimeSpan. It should be 0:0:1.
This will work fine -
<ColorAnimation To="#cecece"
Storyboard.TargetProperty="(Grid.Background)
.(SolidColorBrush.Color)"
FillBehavior="Stop" Duration="0:0:1" />
Also, to allow animation on background property, you should set it to some default value.
<Grid Background="White"/>
I tried with this sample and its working fine on drag enter -
<Grid AllowDrop="True" Background="White" DragDrop.DragEnter="Grid_DragEnter">
<Grid.Triggers>
<EventTrigger RoutedEvent="Grid.DragEnter">
<BeginStoryboard>
<Storyboard>
<ColorAnimation To="#cecece"
Storyboard.TargetProperty="(Grid.Background).
(SolidColorBrush.Color)"
FillBehavior="Stop" Duration="0:0:1" />
</Storyboard>
</BeginStoryboard>
/EventTrigger>
</Grid.Triggers>
<TextBlock Margin="12,12,20,12" Name="txtDragDropStatus"
Text="Drag file here or use file menu to load your report"/>
</Grid>