wpf - How to set DataContext with binding? -

i have dockpanel set this

<window ... > <dockpanel x:name="mydock" datacontext="{binding honapoklist}" > 

inside dockpanel there textbox, this

<textbox x:name="tbcount" text="{binding path=count,mode=oneway}" /> </dockpanel>    </window> 

this how set honapoklist, it's list string>

public list<string> honapoklist;     public mainwindow()     {         initializecomponent();         honapoklist = new list<string>();                    honapok.itemssource = honapoklist;         honapoklist.add("january");         honapoklist.add("february");         honapoklist.add("march");     } 

i want textbox display number of elements in honapoklist ( 3 in example), nothing in it. why that?

window doesn't have default datacontext, looks you're assuming set itself. can set either in constructor:

datacontext = this; 

or in xaml:

<window datacontext="{binding relativesource={relativesource self}}"> 

you're going need change honapoklist property, not field now, in order bind it.