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copied!<p>You can't do this because although <code>Margin.Left</code> gets or sets, it's not used like a variable. Just like <code>Padding</code>.</p> <p>As you may notice, <code>Margin</code> (as for <code>Padding</code>) is a property and <code>Thickness</code> is its value. So, when you say</p> <pre><code>label1.Margin.Left = MainGrid.ActualHeight / 2 - label1.ActualHeight / 2; </code></pre> <p>you are only editing a copy <em>(<code>Margin</code>)</em> because <code>Margin</code> returns a struct (<code>Thickness</code>) . That's why you receive an error. The changes are not saved because it's a copy!</p> <p>Basically, although you can change the value of <code>Object.Margin.Left</code> to a specific value yet it wouldn't save/change the object <code>Margin</code> property and that's why you get an error.</p> <hr> <h2>For example</h2> <p>We can NOT say </p> <pre><code>label1.Margin.Left = MainGrid.ActualHeight / 2 - label1.ActualHeight /2; </code></pre> <p>but we can say</p> <pre><code>Thickness NewThickness = new Thickness(); //Initialize a new Thicnkess NewThickness.Left = MainGrid.ActualHeight / 2 - label1.ActualHeight /2; //Set the left property of NewThickness label1.Margin = NewThickness; //Apply the changes to label1 </code></pre> <p>This means that, because <code>Margin</code> is a property, you are not allowed to change its <code>Thickness</code> directly.</p> <hr> <p>Alternatively, you can use the following which I believe to be easier to set a <code>Margin</code> of an object</p> <pre><code>label1.Margin = new Thickness(double left, double top, double right, double bottom); </code></pre> <p>Thanks, <br>I hope you find this helpful :)</p>

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