Are you have this like error?
Error: does not contain a definition for listView1_SelectionChanged; and no extension method;listView1_SelectionChanged; accepting a first argument of type; could be found (are you missing a using directive or an assembly reference?)
If your answer is positive, there are two way
<listview canvas.left="483" canvas.top="276" fontsize="14" height="174" itemssource="{Binding}" name="listView1" tabindex="5" width="492">SelectionChanged="listView1_SelectionChanged" >
<listview.itemcontainerstyle>
</listview.itemcontainerstyle></listview>
delete the SelectionChanged="listView1_SelectionChanged"
or
right click on "listView1_SelectionChanged" and choose "Navigate to Event Handler" option for go on code behind!