Connection to the database in WPF with MVVM design pattern

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C#

WPF

MS-Access

database

MVVM

, +

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. but 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?

What I have tried:

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()  
       {  
       }  
   }