TextBox Binding in XAML

Question

Hi ,

Anyone please help me

My textbox will show listview seleted item 

 

<TextBox Name="txt1" HorizontalAlignment="Left" Height="23" Margin="46,90,0,0" TextWrapping="Wrap" Text="{Binding ElementName=_PList,Path=SelectedItem.FirstName,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" VerticalAlignment="Top" Width="120" Grid.Column="1" Grid.RowSpan="2"/>

 

 if I modify like this I can add new item

<TextBox Name="txt1" HorizontalAlignment="Left" Height="23" Margin="46,90,0,0" TextWrapping="Wrap" Text="{Binding Path=Firstname,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" VerticalAlignment="Top" Width="120" Grid.Column="1" Grid.RowSpan="2"/>

 

my question is how to achieve both scenario in binding way

 

I want to connect First property to Firstname,Firstname is model class property

 

I have added below logic in my viewmodel 

public string First

{

get { return _First; }

set { SetProperty(ref this._First, value); }

}

 

public void AddPerson()

{

this.PersonMaster.Add(new Person()

{

FirstName=this.First             

}

);

}