C#

using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.IO;
    using System.Linq;
    using System.Runtime.Serialization.Json;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows.Forms;
   
    namespace Demo
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }
            List<MyModel> data;
            private void Form1_Load(object sender, EventArgs e)
            {
                data = GetJsonFromFile(@"MyData.json");
            }
            private List<MyModel> GetJsonFromFile(string path)
            {
                using (var stream = new MemoryStream(Encoding.UTF8.GetBytes(File.ReadAllText(path))))
                {  
                    DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(List<MyModel>));
                    List<MyModel> data = (List<MyModel>)serializer.ReadObject(stream);
                    return data;
                }
            }
   
            private void button_Click(object sender, EventArgs e)
            {
                CustomMessage frm = new CustomMessage();
                frm.ShowDialog();
   
                MyModel model = data[0];
                Button btn = sender as Button;
                switch (btn.Text.ToString())
                {
                    //A
                    case "A":
                        List<string> A = model.a5;
                        button5.Text = A[0];
                        break;
                    case "A1":
                        string A1 = model.a1;
                        button1.Text = A1;
                        break;
                    case "A2":
                        string A2 = model.a2;
                        button2.Text = A2;
                        break;
                    case "A3":
                        string A3 = model.a3;
                        button3.Text = A3;
                        break;
                    case "A4":
                        string A4 = model.a4;
                        button4.Text = A4;
                        break;
                    //B
                    case "B":
                        List<string> B = model.b5;
                        button12.Text = B[0];
                        break;
                    case "B1":
                        string B1 = model.b1;
                        button13.Text = B1;
                        break;
                    case "B2":
                        string B2 = model.b2;
                        button14.Text = B2;
                        break;
                    case "B3":
                        string B3 = model.b3;
                        button15.Text = B3;
                        break;
                    case "B4":
                        string B4 = model.b4;
                        button16.Text = B4;
                        break;
                    //C
                    case "C":
                        List<string> C = model.c5;
                        button17.Text = C[0];
                        break;
                    case "C1":
                        string C1 = model.c1;
                        button18.Text = C1;
                        break;
                    case "C2":
                        string C2 = model.c2;
                        button19.Text = C2;
                        break;
                    case "C3":
                        string C3 = model.c3;
                        button20.Text = C3;
                        break;
                    case "C4":
                        string C4 = model.c4;
                        button21.Text = C4;
                        break;
                    //D
                    case "D":
                        List<string> D = model.d5;
                        button7.Text = D[0];
                        break;
                    case "D1":
                        string D1 = model.d1;
                        button8.Text = D1;
                        break;
                    case "D2":
                        string D2 = model.d2;
                        button9.Text = D2;
                        break;
                    case "D3":
                        string D3 = model.d3;
                        button10.Text = D3;
                        break;
                    case "D4":
                        string D4 = model.d4;
                        button11.Text = D4;
                        break;
                    //???
                    case "???":
                        List<string> RR = model.rr;
                        button6.Text = RR[0];
                        break;
   
                }
            }

[DataContract]
        public class MyModel
        {
            [DataMember]
            public string a1 { get; set; }
            [DataMember]
            public string a2 { get; set; }
            [DataMember]
            public string a3 { get; set; }
            [DataMember]
            public string a4 { get; set; }
            [DataMember]
            public List<string> a5 { get; set; }
            [DataMember]
            public string b1 { get; set; }
            [DataMember]
            public string b2 { get; set; }
            [DataMember]
            public string b3 { get; set; }
            [DataMember]
            public string b4 { get; set; }
            [DataMember]
            public List<string> b5 { get; set; }
            [DataMember]
            public string c1 { get; set; }
            [DataMember]
            public string c2 { get; set; }
            [DataMember]
            public string c3 { get; set; }
            [DataMember]
            public string c4 { get; set; }
            [DataMember]
            public List<string> c5 { get; set; }
            [DataMember]
            public string d1 { get; set; }
            [DataMember]
            public string d2 { get; set; }
            [DataMember]
            public string d3 { get; set; }
            [DataMember]
            public string d4 { get; set; }
            [DataMember]
            public List<string> d5 { get; set; }
            [DataMember]
            public List<string> rr { get; set; }
        }

_hubProxy.Invoke("SomeMethodName", model).ContinueWith((t) =>
{
    if (t.Exception != null && t.Exception.InnerException != null)
    {
        // Do something here. Log the error
        throw t.Exception.InnerException;
    }
});

I am trying to keep thread/process active, when application is minimized to tray. As i want some tasks to be performed in background in app state = minimize.

As I have defined a async delegate to capture a callback for an event, when the app is minimized the process is completed and the app is supposed to listen for event fire, but when the app is minimized the app does not reports to the event, and the callback to the delegate doesn't occurs but the following event fire and all the respective tasks are performed when app is maximized.

Please guide and help me.

NAVCient = new NAVEntities.NAV(new Uri("myhost/.../ODataV4"));
NAVCient.Credentials = new Net.NetworkCredential("usr", "psw");
List<NAVEntities.Company> company = NAVCient.Company.ToList;

NAVCient = new NAVEntities.NAV(new Uri("myhost/.../ODataV4/Company('MyTest')")); 
NAVCient.Credentials = new Net.NetworkCredential("usr", "psw"); 
List<NAVEntities.Customer_Card> Customers = NAVCient.Customer_Card.ToList;

"An unhandled exception of type 'Microsoft.OData.Core.ODataException' occurred in Microsoft.OData.Core.dll
Additional information: When writing a JSON response, a user model must be specified and the entity set and entity type must be passed to the ODataMessageWriter.CreateODataEntryWriter method or the ODataFeedAndEntrySerializationInfo must be set on the ODataEntry or ODataFeed that is being written."