Wpf label height automatically changes w.r.t content

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WPF

I want to set tooltip information on listview , where i am creating form.
My label width is fixed , just height is changing as content of height. I am able to do this in c# with label.autosize set to true, but i want implement in c#.

Please help me with this.

What I have tried:

XMAL

In code, tooltip.Content = BCJKDFJHASJFKAJKASDLFJKLKDFLSDLFKLSDFKLKJLDSKFLSD";