Getting selected Item in DataGrid in WPF

Question

I have a datagrid and textboxes. When I select a row in DataGrid I want the textboxes to be filled with related data of that datagrid column. Here is the picture.,

Answer 1

Here's how you could do it with bindings. The "Text" parameter of each textbox should be modified thusly:

Text = "{Binding ElementName = personelEntityDataGrid, Path = CurrentItem.<FIELD_NAME_HERE>}"

so for the nameBox, you would have:

Text = "{Binding ElementName = personelEntityDataGrid, Path = CurrentItem.Name}"

Answer 2

Don't check in Loaded event, instead Check in selectionChanged event, also add a null check to your pers object

private void personelEntityDataGrid_SelectionChanged(object sender, RoutedEventArgs e)
{
    PersonelEntity pers = (PersonelEntity)personelEntityDataGrid.SelectedItem;
    if(pers != null)
    {
    NameBox.Text = pers.Name; // I get exception here
    AgeBox.Text = pers.Age.ToString();
    PhoneNumberBox.Text = pers.PhoneNumber;
    AddresBox.Text = pers.Address;
    }

}