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UCOMIStream stream = null;
  
CreateStreamOnHGlobal(Marshal.StringToHGlobalUni(value), true, out stream);
   
if(stream != null)
  
{
    IPersistStreamInit persistentStreamInit =
      (IPersistStreamInit)WebBrowser.Document;
  
    persistentStreamInit.InitNew();
    persistentStreamInit.Load(stream);
    persistentStreamInit = null;
}
  
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[DllImport("ole32.dll", PreserveSig=false)]
static extern void CreateStreamOnHGlobal(IntPtr hGlobal,
    Boolean fDeleteOnRelease, [Out] out UCOMIStream pStream);
  
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[ComVisible(true), ComImport(), Guid("7FD52380-4E07-101B-AE2D-08002B2EC713"),
   InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
public interface IPersistStreamInit
{
    void GetClassID([In, Out] ref Guid pClassID);
  
    [return: MarshalAs(UnmanagedType.I4)] [PreserveSig]
    int IsDirty();
  
    void Load([In, MarshalAs(UnmanagedType.Interface)] UCOMIStream pstm);
    void Save([In, MarshalAs(UnmanagedType.Interface)] UCOMIStream pstm,
 


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