C#

typedef char CHAR;
typedef CHAR* LPSTR;
typedef wchar_t WCHAR;
typedef WCHAR* LPWSTR;
#ifdef UNICODE
typedef WCHAR TCHAR;
typedef WCHAR* LPTSTR;
#else
typedef CHAR TCHAR;
typedef CHAR* LPSTR;
#endif

// Note: following is only anexample.
// You can more easily get the computer name by using Environment.MachineName.
[DllImport("user32.dll", CharSet=CharSet.Auto)]
static extern bool GetComputerName([Out] string name, ref int size);

[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
public struct Example
{
  public string Field1;
  public string Field2;
  [MarshalAs(UnmanagedType.LPStr)] public string Field3;
}

[DllImport("user.dll", CharSet = CharSet.Unicode)] <br />
int LoginDlg<br />
(<br />
  int    lDSType,<br />
  string lptstrDataSource, <br />
  int    lDSLength,<br />
  string lpctstrUsername, <br />
  string lpctstrPassword,<br />
)

[DllImport("user.dll", CharSet=CharSet.Unicode)]
extern static int LoginDlg(
  int lDSType,
  string lptstrDataSource,
  int lDSLength,
  string lpctstrUsername,
  string lpctstrPassword);

// stores parent node numbers.
Hashtable table = new Hashtable();

// get parent nodes.
for(int i = 0; i < arrayList.Count; i++)
{
   // add parent node to tree view.
   treeView.Items.Add(arrayList[i].ToString());

   // add node to table.
   table.Add(arrayList[i].ToString(), table.Count);

   // skip the child node.
   i++;
}

// get child nodes.
int index;

for(int i = 1; i < arrayList.Count; i++)
{
   // get the parent node index.
   index = table[arrayList[i-1].ToString()];

   // add child node.
   treeView.Items[index].Add(arrayList[i].ToString());

   // skip parent nodes.
   i++;
}