string sourceData = "Some string data to store...";
    byte[] unicodeText = Encoding.Unicode.GetBytes(sourceData);
    byte[] utf8Text = Encoding.UTF8.GetBytes(sourceData);

    string uniCodeFormat = "Unicode";
    string utf8DataFormat = "UTF-8";
            
    DragDropEventData dataObject = e.Data as DragDropEventData;
    dataObject.SetData(sourceData);
    dataObject.SetData(uniCodeFormat, unicodeText);
    dataObject.SetData(utf8DataFormat, utf8Text);

    string desiredFormat = uniCodeFormat;
    byte[] data = null;

    // Use the GetDataPresent method to check for the presence of a desired data format.
    // This particular overload of GetDataPresent looks for both native and auto-convertible 
    // data formats.
    if (dataObject.GetDataPresent(desiredFormat))
    {
        // If the desired data format is present, use one of the GetData methods to retrieve the
        // data from the data object.
        data = dataObject.GetData(desiredFormat) as byte[];
    }