C#

DataObject do = new DataObject(".NETControl", this);
this.DoDragDrop(do, DragDropEffects.Move);

protected override void OnDragOver(DragEventArgs e)
{
  // The following dictates that the object can be dropped if supported.
  if (e.Data.GetDataPresent(".NETControl") &&
      (e.AllowedEffect & DragDropEffects.Move) != 0)
    e.Effect = DragDropEffects.Move;
}
protected override void OnDragDrop(DragEventArgs e)
{
  if (e.Data.GetDataPresent(".NETControl") &&
      (e.AllowedEffect & DragDropEffects.Move) != 0)
  {
    Control c = (Control)e.Data.GetData(".NETControl");
    c.Location = new Point(e.X, e.Y);
  }
}

typedef struct FARSTRUCT tagSAFEARRAY {
   unsigned short cDims;       // Count of dimensions in this array.
   unsigned short fFeatures;   // Flags used by the SafeArray
                        // routines documented below.
#if defined(WIN32)
   unsigned long cbElements;   // Size of an element of the array.
                        // Does not include size of
                        // pointed-to data.
   unsigned long cLocks;      // Number of times the array has been 
                        // locked without corresponding unlock.
#else
   unsigned short cbElements;
   unsigned short cLocks;
   unsigned long handle;      // Used on Macintosh only.
#endif
   void HUGEP* pvData;             // Pointer to the data.
   SAFEARRAYBOUND rgsabound[1];      // One bound for each dimension.
} SAFEARRAY;

BOOL GetComputerName(/*[out]*/ LPTSTR lpBuffer, /*[in,out]*/ LPDWORD lpnSize);

[DllImport("user32.dll", CharSet=CharSet.Auto)]
private static extern bool GetComputerName(string buffer,
  [MarshalAs(UnmanagedType.U4)] ref int size);
//...
int size = 16;
string buffer = new string(size, '\0'); // Initialize to null chars.
GetComputerName(buffer, ref size);

			//Reset Stream to beginning<br />
			pIStream.Seek(pInZero,STREAM_SEEK_Flags.STREAM_SEEK_SET, out pSeekResult);<br />
<br />
			//Construct byte buffer<br />
			sbyte[] buffer = new sbyte[bufferSize];<br />
<br />
			string charReader = "";	//String holders<br />
			int read;				//Value of read charachters<br />
<br />
			do<br />
			{<br />
				//Read Stream<br />
				pIStream.Read(buffer, bufferSize, out read);<br />
				<br />
				//If something is read<br />
				if (read != 0)<br />
				{<br />
					unsafe<br />
					{<br />
						// Lock array in memory<br />
						fixed(sbyte* pChars = buffer)<br />
						{<br />
							//Add to string<br />
							charReader += new string(pChars,0,read,System.Text.Encoding.ASCII);<br />
						}<br />
					}<br />
				}<br />
				//continue until stream end<br />
			}while (read != 0);

    UCOMIStream stream = ...;
    int offset = ....;
    int count = ....;
    byte[] resultBuffer;

    if( stream == null ) throw new ObjectDisposedException("stream");

    int bytesRead = 0;
    object boxBytesRead = bytesRead;
    GCHandle hObject;

    try {
       hObject = GCHandle.Alloc(boxBytesRead, GCHandleType.Pinned);
       IntPtr pBytesRead = hObject.AddressOfPinnedObject();

       if( offset != 0 ) {
           byte[] tmpBuffer = new byte[count - 1];
           stream.Read( tmpBuffer, count, pBytesRead );
           bytesRead = (int)boxBytesRead;
           System.Array.Copy( tmpBuffer, 0, resultBuffer, offset, bytesRead);
       } else {
          stream.Read( resultBuffer, count, pBytesRead );
          bytesRead = (int)boxBytesRead;
       }
    } finally {
       if( hObject.IsAllocated() ) {
            hObject.Free();
       }
    }
}