WPF

<Canvas>
    <Button Click="Button_Click">
        Set width to 100
    </Button>
              
    <Button Canvas.Top="30"
        Animate width to 250
    <Button.Triggers>
        <EventTrigger RoutedEvent="Button.Click">
            <BeginStoryboard>
                <Storyboard>
                    <DoubleAnimation Storyboard.TargetName="RedRectangle" Storyboard.TargetProperty="Width" To="250" Duration="0:0:1" />
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Button.Triggers>
    </Button>

    <Rectangle Name="RedRectangle" Width="25" Height="25" Canvas.Top="70" Fill="Red" Stroke="Black" />
</Canvas>

private void Button_Click(object sender, RoutedEventArgs e)
{
    RedRectangle.Width = 100;
}

public class SubControlBase : UserControl {   public static DependencyProperty TitleProperty =            DependencyProperty.Register(                "Title",                typeof(String),                typeof(XceedSubControl), //Do you use SubControlBase here?                new FrameworkPropertyMetadata(                    new PropertyChangedCallback(ChangeTitle)));        public String Title        {            get { return (String)GetValue(TitleProperty); }            set { SetValue(TitleProperty, value); }        }        private static void ChangeTitle(DependencyObject source, DependencyPropertyChangedEventArgs e)        {            (source as XceedSubControl).UpdateTitle((String)e.NewValue);        }        private void UpdateTitle(String Title)        {            SetTitle(Title);        }        public void SetTitle(String title)        {            ControlTitle.Text = title;        }}//class Examplepublic partial class XceedSubControl : SubControlBase{}

string[] fileNames = null;

if (e.Data.GetDataPresent(DataFormats.FileDrop, false))

{

fileNames = e.Data.GetData(DataFormats.FileDrop, true) as string[];

foreach (string fileName in fileNames)

{

FileInfo fileInfo = new FileInfo(fileName);

// Some logic goes here...

}

}

else if (e.Data.GetDataPresent("FileGroupDescriptor"))

{

Stream theStream = (Stream)e.Data.GetData("FileGroupDescriptor");

byte[] fileGroupDescriptor = new byte[512];

theStream.Read(fileGroupDescriptor, 0, 512);

StringBuilder fileName = new StringBuilder("");

// Get the file name of the attached file

for (int i = 76; fileGroupDescriptor[i] != 0; i++)

{

fileName.Append(Convert.ToChar(fileGroupDescriptor[i]));

}

theStream.Close();

string path = Path.GetTempPath();

string theFile = path + fileName.ToString();

// Define full path for temp file

// Get the raw file into memory

MemoryStream ms = (MemoryStream)e.Data.GetData("FileContents", true);

byte[] fileBytes = new byte[ms.Length];

ms.Position = 0;

ms.Read(fileBytes, 0, (int)ms.Length);

FileStream fs = new FileStream(theFile, FileMode.Create);

fs.Write(fileBytes, 0, (int)fileBytes.Length);

fs.Close();

// Get the FileInfo to use

FileInfo tempFile = new FileInfo(theFile);

// Verify the file was created

if (tempFile.Exists)

{

// Some Logic goes here

// Delete the temporary file once done with it

tempFile.Delete();

}