How to select data from DataGrid in WPF MVVM with database

Question

Hi

I am working in wpf with mvvm light. I want to select data from data grid and put them in textboxes. 

 

let me explain my project scenario.

UI:

<Grid ShowGridLines="True">
        <Grid.RowDefinitions>
            <RowDefinition>RowDefinition>
            <RowDefinition>RowDefinition>
        Grid.RowDefinitions>
        <StackPanel Orientation="Vertical" HorizontalAlignment="Center"
                    Grid.Row="0"
                    VerticalAlignment="Center">
            <StackPanel Orientation="Horizontal" Margin="0,0,0,10">
                <TextBlock Name="name" Text="Name:" Margin="0,0,30,0">TextBlock>
                <TextBox x:Name="text1"
                         Text="{Binding UserLoginData.Name,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                         Width="100">TextBox>
            StackPanel>

            <StackPanel Orientation="Horizontal" Margin="0,0,0,10">
                <TextBlock Name="password" Text="Password:" Margin="0,0,12,0">TextBlock>
                <TextBox x:Name="text2"
                         Text="{Binding UserLoginData.Password,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                         Width="100">TextBox>
            StackPanel>

            <StackPanel Orientation="Horizontal" Margin="0,0,0,0">
                <Button Content="Login" Margin="0,0,25,0" Padding="5"
                        Command="{Binding SaveCommand}">
                Button>
            StackPanel>
        StackPanel>

        <DataGrid Grid.Row="1" x:Name="MainDataGrid"
                ItemsSource="{Binding users}"
                  SelectedItem="{Binding Path=SelectedUsers,Mode=TwoWay}" SelectionChanged="MainDataGrid_SelectionChanged">
        DataGrid>
    Grid>

I have two text boxes here Name and password. When we values of them that values sotres in my database and add to Datagrid as below image.

 

 

Now what i want is when we select on one of the data in Datagrid it should be add into that two text boxes so i can perform update, delete from it. but here i couldn't get data from datagrid in text boxes when i select on grid. 

I am providing you my viewmodel, datacontext and model class here. so you can find solution from it.

 

View model class: 

public class UserLoginViewModel:ViewModelBase
    {

        public UserLoginViewModel()
        {
            UserLoginData = new UserLoginData();
            users = new ObservableCollection(GetUsers());
        }

        internal IEnumerable GetUsers()
        {
            DataBaseContext baseContext = new DataBaseContext();
            return baseContext.userLogins.ToList();
        }

        private ObservableCollection _SelectedUsers;
        public ObservableCollection SelectedUsers
        {
            get => _SelectedUsers;
            set
            {
                if(value != _SelectedUsers)
                {
                    _SelectedUsers = value;
                    RaisePropertyChanged();
                }
            }
        }

        private ObservableCollection _users;
        public ObservableCollection users
        {
            get => _users;
            set { _users = value; RaisePropertyChanged(); }
        }

        private UserLoginData _UserLoginData;
        public UserLoginData UserLoginData
        {
            get => _UserLoginData;
            set { _UserLoginData = value; RaisePropertyChanged(); }
        }

        public ICommand SaveCommand => new RelayCommand(SaveData);

        public object ObservableCollectoin { get; private set; }

        private void SaveData()
        {
            DataBaseContext baseContext = new DataBaseContext();
            baseContext.userLogins.Add(UserLoginData);
            baseContext.SaveChanges();
        }
        }
    }

 Datacontext:

public class DataBaseContext: DbContext
   {
       public DataBaseContext() : base("DbBindingContext")
       {
       }

       public DbSet userLogins { get; set; }
   }

 Model:

public class UserLoginData
   {
       [Key]
       public int Id { get; set; }
       public string Name { get; set; }
       public string Password { get; set; }
   }

tell me where i am wrong. and what shoud i do. 

hope will get better solution. Thanks in advance.