Connection to the database in WPF with MVVM design pattern

Question

Good evening,
I am a beginner at MVVM design patter and WPF I am trying to make a small example of connection to the MS Access database using the WPF and MVVM Light Toolkit patter design. here is the code I insert for the connection:

Model / DataConnection.cs

public  class DataConnection
   {
        public void OpenConnection()
        {
        OleDbConnection con = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=db.accdb;" +
              "Persist Security Info=False;");


               OleDbCommand cmd = con.CreateCommand();
               cmd.CommandText = "Insert into table (num,nom)Values(123,'nom1')";
               cmd.Connection = con;
               con.Open();
               cmd.ExecuteNonQuery();
               MessageBox.Show("Record Submitted", "Congrats");
                   }
   }

 

ViewModel / MainViewModel.cs

 public class MainViewModel : ViewModelBase
    {
 private DataConnection _dataconnection;
 public MainViewModel(DataConnection dataconnexion)
        {
            _dataconnection = dataconnexion;
          _dataconnection.OpenConnection();

 }
}

 

 ViewModel / ViewModelLocator.cs

public class ViewModelLocator
   {
       static ViewModelLocator()
       {
           ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default);
SimpleIoc.Default.Register<DataConnection>();
SimpleIoc.Default.Register<MainViewModel>();
       }
 public MainViewModel Main
       {
           get
           {
               return ServiceLocator.Current.GetInstance<MainViewModel>();
           }
       }

       /// <summary>
       /// Cleans up all the resources.
       /// </summary>
       public static void Cleanup()
       {
       }
   }

 

when i run the program it does not do anything and when i debug i find that the instruction stops at the instruction level

con.Open();

model / DataConnection.cs file and then it goes to MainWindow.xaml.cs.
I do not find why he does not continue the execution of all the instructions?