data binding - How to Bind a TextBox in DataGrid to a List in Wpf? -


am working on new wpf project , struggling binding textbox in datagrid list of objects in wpf. can me fix?

this code (simplified version) generate datagrid rows binding orders object. user can changed order items , should bind underline object. once user clicked read orders button displaying changes in textblock. issue: changes in textbox not updating orders object.

observablecollection<stxordr> orders = new observablecollection<stxordr>();  private void window_initialized(object sender, eventargs e) {     orders.add(new stxordr() { id = 1, desc = "order-#1", item1 = "11", item2 = "12", item3 = "13" });     orders.add(new stxordr() { id = 2, desc = "order-#2", item1 = "21", item2 = "22", item3 = "23" });     orders.add(new stxordr() { id = 3, desc = "order-#3", item1 = "31", item2 = "32", item3 = "33" });                             dg2.itemssource = orders; }  private void readupdatedorders(object sender, routedeventargs e) {     txtblk.text = "";     foreach (stxordr odr in orders)     {         txtblk.text += string.format("{0}:   {1} - {2} - {3}\n", odr.desc, odr.item1, odr.item2, odr.item3);     } }

window xml

<datagrid x:name="dg2"  horizontalalignment="left" margin="21,295,0,0" verticalalignment="top" height="230" width="451" autogeneratecolumns="false" itemssource="{binding source=orders}" > <datagrid.columns>     <datagridtextcolumn header="id" binding="{binding id}" />     <datagridtextcolumn header="desc" binding="{binding desc}"   width="80"/>     <datagridtextcolumn header="item 1" binding="{binding item1}"  width="60"/>     <datagridtextcolumn header="item 2" binding="{binding item2}"  width="60"/>     <datagridtemplatecolumn header="item 3" >         <datagridtemplatecolumn.celltemplate>             <datatemplate>                 <textbox text="{binding item3, mode=onewaytosource}" width="60" />                                         </datatemplate>         </datagridtemplatecolumn.celltemplate>     </datagridtemplatecolumn> </datagrid.columns> </datagrid>  <textblock x:name="txtblk" horizontalalignment="left" margin="489,295,0,0" textwrapping="wrap" text="  updated order details:"             verticalalignment="top" height="176" width="408" background="#fffffcbc"/> <button x:name="btn2_copy" content="read orders" horizontalalignment="left" margin="489,476,0,0"          verticalalignment="top" width="94" click="readupdatedorders"/>

screenshot of ui window

i think things looks correct. make sure orders.cs implements inotifypropertychanged , line of code

<textbox text="{binding item3, mode=onewaytosource}" width="60" />

is updated mode = twoway , updatesourcetrigger = propertychanged. change to

<textbox text="{binding item3, mode=twoway, updatesourcetrigger=propertychanged}" width="60" />

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