Set ComboBox Height

[System.Runtime.InteropServices.DllImport("user32.dll")]

private static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam); 

private const int CB_SETITEMHEIGHT = 0x153; 

private bool SetComboBoxHeight(ComboBox cb, int height) 

{ 

    int rtn = SendMessage(cb.Handle, CB_SETITEMHEIGHT, -1, height); 

    cb.Refresh(); 

    return rtn != -1; 

}