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There is a bug in .NET 4 with one way to source bindings that it calls getter for OneWayToSource bindings thats why you are having this problem.You can verify it by putting breakpoint on tb.DataContext = _vm; you will find setter is called and just after that getter is called on Text property.You can resolve your problem by manually feeding the viewmodel values from view before assigning the datacontext..NET 4.5 resolves this issue. see heresee here and here toohere too

private void Button1_Click(object sender, RoutedEventArgs e)
{
   Debug.Print("'Set DataContext' button clicked");       
    _vm.Text=tb.Text;
    tb.DataContext = _vm;
}

There is a bug in .NET 4 with one way to source bindings that it calls getter for OneWayToSource bindings thats why you are having this problem.You can verify it by putting breakpoint on tb.DataContext = _vm; you will find setter is called and just after that getter is called on Text property.You can resolve your problem by manually feeding the viewmodel values from view before assigning the datacontext..NET 4.5 resolves this issue. see here and here too

private void Button1_Click(object sender, RoutedEventArgs e)
{
   Debug.Print("'Set DataContext' button clicked");       
    _vm.Text=tb.Text;
    tb.DataContext = _vm;
}

There is a bug in .NET 4 with one way to source bindings that it calls getter for OneWayToSource bindings thats why you are having this problem.You can verify it by putting breakpoint on tb.DataContext = _vm; you will find setter is called and just after that getter is called on Text property.You can resolve your problem by manually feeding the viewmodel values from view before assigning the datacontext..NET 4.5 resolves this issue. see here and here too

private void Button1_Click(object sender, RoutedEventArgs e)
{
   Debug.Print("'Set DataContext' button clicked");       
    _vm.Text=tb.Text;
    tb.DataContext = _vm;
}
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There is a bug in .NET 4 with one way to source bindings that it calls getter for OneWayToSource bindings thats why you are having this problem.You can verify it by putting breakpoint on tb.DataContext = _vm; you will find setter is called and just after that getter is called on Text property.You can resolve your problem by manually feeding the viewmodel values from view before assigning the datacontext..NET 4.5 resolves this issue. see here and here too

private void Button1_Click(object sender, RoutedEventArgs e)
{
   Debug.Print("'Set DataContext' button clicked");       
    _vm.Text=tb.Text;
    tb.DataContext = _vm;
}