How to display database value to a textbox in WPF MVVM?

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WPF

MVVM

Binding

I have a textbox which need to bind with database value
Like,i have a text box a combo box and a button.Mr X selects a value(say Employee No) from combo box and click the button.Based on the value(say Employee No) the associated name should fill in the text box.How can i achieve?

What I have tried:

<TextBox Template="{StaticResource TextBoxBaseControlTemplate}" x:Name="txttitle1" HorizontalAlignment="Left" Height="30" Margin="578,22,0,0" TextWrapping="Wrap" Text="{Binding PODetail.PO_TITLE1,Mode=TwoWay}" VerticalAlignment="Top" Width="152"/>

Below is the get/set of my model class

    public PurchaseOrderModel podetail = new PurchaseOrderModel();
        public PurchaseOrderModel PODetail
        {
            get { return podetail; }
            set { podetail = value; OnPropertyChanged("PODetail"); }
        } 
       
  PODetail.PO_TITLE1 = pom.PO_TITLE1;-->In this the value sets to text box in viewmodel but not reflecting to View