C#

public class Comanda
            {
                public string id_comanda { get; set; }
                public int pret_total { get; set; }
                public string modalitate_plata { get; set; }
            }

            public class Data
            {
                public int status { get; set; }
                public string status_message { get; set; }
                public Comanda comanda { get; set; }
            }

            public class RootObject
            {
                public Data data { get; set; }
                public bool error { get; set; }
                public List<object> errors { get; set; }
            }

RootObject GetProduse_vars = new System.Web.Script.Serialization.JavaScriptSerializer().Deserialize<RootObject>(text);
                Console.WriteLine(GetProduse_vars.error);

public class ExcelInteropService
{
    private const string EXCEL_CLASS_NAME = "EXCEL7";

    private const uint DW_OBJECTID = 0xFFFFFFF0;

    private static Guid rrid = new Guid("{00020400-0000-0000-C000-000000000046}");

    public delegate bool EnumChildCallback(int hwnd, ref int lParam);

    [DllImport("Oleacc.dll")]
    public static extern int AccessibleObjectFromWindow(int hwnd, uint dwObjectID, byte[] riid, ref Microsoft.Office.Interop.Excel.Window ptr);

    [DllImport("User32.dll")]
    public static extern bool EnumChildWindows(int hWndParent, EnumChildCallback lpEnumFunc, ref int lParam);

    [DllImport("User32.dll")]
    public static extern int GetClassName(int hWnd, StringBuilder lpClassName, int nMaxCount);

    public static Microsoft.Office.Interop.Excel.Application GetExcelInterop(int? processId = null)
    {
        var p = processId.HasValue ? Process.GetProcessById(processId.Value) : Process.Start("excel.exe");
        p.WaitForInputIdle();
        System.Threading.Thread.Sleep(60000);
        Debug.Assert(p != null, "p != null");
        try {
            return new ExcelInteropService().SearchExcelInterop(p);
        }
        catch (Exception) {
            Debug.Assert(p != null, "p != null");
            return GetExcelInterop(p.Id);
        }
    }

    private bool EnumChildFunc(int hwndChild, ref int lParam)
    {
        var buf = new StringBuilder(128);
        GetClassName(hwndChild, buf, 128);
        if (buf.ToString() == EXCEL_CLASS_NAME) { lParam = hwndChild; return false; }
        return true;
    }

    private Microsoft.Office.Interop.Excel.Application SearchExcelInterop(Process p)
    {
        bool timeout = false;
        DateTime start = new DateTime();
        TimeSpan span = new TimeSpan();
        TimeSpan d = new TimeSpan(0, 1, 0);
        Microsoft.Office.Interop.Excel.Window ptr = null;
        int hwnd = 0;
        int hWndParent = 0;
        int hr = -1;

        Debug.Assert(p != null, "p != null");
        try {
            start = DateTime.Now;
            do {
                do {
                    i++;
                    hWndParent = (int)p.MainWindowHandle;
                    if (hWndParent == 0) {
                        Debug.WriteLine("MainWindowNotFound");
                        break;
                    }

                    EnumChildWindows(hWndParent, EnumChildFunc, ref hwnd);
                    if (hwnd == 0) {
                        Debug.WriteLine("ChildWindowNotFound");
                        break;
                    }

                    hr = AccessibleObjectFromWindow(hwnd, DW_OBJECTID, rrid.ToByteArray(), ref ptr);
                    if (hr < 0) {
                        Debug.WriteLine("AccessibleObjectNotFound");
                        break;
                    }
                    if (ptr != null)
                        return ptr.Application;
                } while (ptr == null);
                span = DateTime.Now - start;
                if (span > d)
                    timeout = true;
            } while (timeout == false);
        }
        catch (Exception ex) {
            Debug.Write("Search Exception - ");
            Debug.WriteLine(ex.Message);
            return null;
        }
        try {
            p.CloseMainWindow();
        }
        catch (Exception ex) {
            Debug.Write("CloseWinMain Exception = ");
            Debug.WriteLine(ex.Message);
        }
        return null;
    }
}

myDataTable.Select("Guid IN ('8556c1fd-d4a1-4c1c-b2af-c1fa9403ce4e')")

myDataTable.Select("Guid = '8556c1fd-d4a1-4c1c-b2af-c1fa9403ce4e'")