In my C# XAML Windows 8.1 app, how can I iterate over my ListView? -

i'm new windows 8.1 development, xaml, , c#, if question rudimentary, please forgive me.

i've got <page> in app contains <listview>, so:

<listview itemssource="{binding mode=twoway}" x:name="listview_statistical">     <listview.itemtemplate>         <datatemplate>             <stackpanel orientation="horizontal">                 <textblock style="{staticresource subheadertextblockstyle}" width="100"  margin="10,20">                     <run text="x/y " />                     <!--<run text="{binding source={staticresource thispage}, path=i}" />-->                 </textblock>                 <textbox horizontalalignment="left" text="{binding xval}" placeholdertext="x" inputscope="number" fontsize="28" width="100" margin="0,10,10,10" />                 <textbox horizontalalignment="left" text="{binding yval}" placeholdertext="y" inputscope="number" fontsize="28" width="100" margin="0,10,10,10" />             </stackpanel>         </datatemplate>     </listview.itemtemplate> </listview> 

in code behind, set datacontext so:

listview_statistical.datacontext = this.statisticalpoints; 

this.statisticalpoints defined such:

public observablecollection<statisticalpoint> statisticalpoints {     { return (observablecollection<statisticalpoint>)getvalue(statisticalpointsproperty); }     set {          setvalue(statisticalpointsproperty, value);         notifypropertychanged("statisticalpoints");     } }  // using dependencyproperty backing store statisticalpoints.  enables animation, styling, binding, etc... public static readonly dependencyproperty statisticalpointsproperty =     dependencyproperty.register("statisticalpoints", typeof(observablecollection<statisticalpoint>), typeof(entercalc), new propertymetadata(0)); 

i'm not sure if making dependencyproperty necessary, or if making follow inotifypropertychanged necessary, don't seem hurt.

anyway, in constructor, add bunch of stuff statisticalpoints:

this.statisticalpoints = new observablecollection<statisticalpoint>(); this.statisticalpoints.add(new statisticalpoint() { xval = 1.0, yval = 2.0 }); this.statisticalpoints.add(new statisticalpoint() { xval = 33.0, yval = 44.0 }); this.statisticalpoints.add(new statisticalpoint() { xval = 555.0, yval = 666.0 }); this.statisticalpoints.add(new statisticalpoint() { xval = 0.7, yval = 0.8 }); 

and when load page, indeed see 5 rows in listview, populated defined in initialization of this.statisticalpoints.

the part i'm having trouble this:

i change first value in first <textbox> in listview, hit save button... listview.items doesn't have change reflected, , can't figure out how @ <textbox> itself.

what want have bunch of statistical points modifiable user , able save changes. that, feel need read value in <textbox>es, can't figure out how that.

alternatively, if 'right way' keep data in this.statisticalpoints up-to-date when changes made in <textbox>es, thought twoway binding mode it, neither listview.items nor this.statisticalpoints changed when make changes in <textbox>.

i do not have event handlers set in <textbox> elements, can see, need them, or missing obvious?

thanks in advance can give me!

to solve initial problem, make binding each text box mode="twoway". reasons beyond comprehension, mode default oneway on pretty in windows store apps.

making itemssource binding 2 way next nothing, ui isn't changing collection itself (by changing, mean replacing). iterate on collection, iterate on this.statisticalpoints , have current data.

now, have ton of other misconceptions try , run through them:

• you never showed save button, bindings either update source or don't. save button used persist changes view model model.
• speaking of view models, don't appear have one. shouldn't directly setting data context of controls, , shouldn't have in code-behind. create proper view model object page, , bind itemssource public property of view model.
• notifypropertychanged on collection usually unnecessary unless replacing collection in code.
• having won't hurt though, except, setter of backing property of dependencyproperty (dp) never called framework, putting there weird
• and don't need dp @ all. dps there parent control can bind data special user control. until using user controls, , understand how dps work, shouldn't need use them.