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copied!<p>You appear to be creating a <em>new</em> Customer object that is not in your <em>ObservableCollection</em></p> <pre><code>tempCustomerobj = new Customer(c); </code></pre> <p>and then editing that <em>new</em> object.</p> <pre><code>CustomerDataGrid.DataContext = tempCustomerobj; </code></pre> <p>Doing that will not in any way affect the original Customer object that is still in your <em>ObservableCollection</em>.</p> <p>To solve, don't create a <em>new</em> Customer, but rather edit an existing one.</p> <p><strong>Update</strong> </p> <p><em>Based on your comments</em></p> <p>The line</p> <pre><code>customerobj = c; //Original object </code></pre> <p>causes <code>customerobj</code> to be an alias to <code>c</code>, your object that is actually in the <code>ObservableCollection</code>.</p> <p>The line </p> <pre><code>customerobj = tempCustomerobj; </code></pre> <p>causes <code>customerobj</code> to now be an alias to <code>tempCustomerobj</code>, which is your brand-new Customer object that is (I presume) a <em>clone</em> of <code>c</code>.</p> <p>Change your constructor to </p> <pre><code>public EditCustomerWindow(Customer c) { InitializeComponent(); CustomerDataGrid.DataContext = c; } </code></pre> <p><strong>Update 2</strong></p> <p>The object you're editing should support IEditableObject. See </p> <p><a href="https://stackoverflow.com/a/1091240/141172">https://stackoverflow.com/a/1091240/141172</a></p> <p>Alternatively, you can serialize the object before you start editing and deserialize the saved state if the edit is canceled.</p>

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