How to implement template control for dynamically add controls in wpf?

Why don't you take "sample label, persian translate label, textboxes and add voice button" and put them in a usercontrol (Let's give it the name MyUserControl)

then instead of adding that user control directly on the grid of your window, add a stack panel (lets name it MyStackPanel), and add that user control into the stack panel (stack panel must have the orientation set to vertical)

Now when the user clicks on the "Plus" button your code will be:

MyStackPanel.Children.Add(new MyUserControl() { Margin = new Thickness(0, 5, 0, 0) });

This will give you the same controls you asked for with a margin top = 5.

You will only write code once for the user control, and all the added controls (after clicking on the plus button) will have the same code.

Edit: If you want to delete MyUserControl when clicking the delete button add the following code for for the StackPanel (MyStackPanel) on the main window (look for ButtonBase.Click):

<StackPanel Height="236" HorizontalAlignment="Left" ButtonBase.Click="stackPanel1_Click" Name="stackPanel1" VerticalAlignment="Top" Width="491">

and for the event of the StackPanel:

 private void stackPanel1_Click(object sender, RoutedEventArgs e)
    {
        if (((UserControl1)e.Source).Tag.ToString() == "1")
        {
            stackPanel1.Children.Remove(((UserControl1)e.Source));
        }
        else
        {
            MessageBox.Show("Another button was clicked");
        }

    }

Now the delete button on the user control must have the following line of code:

 this.Tag = 1;