c# - Binding TextBlock to a log file in WPF application -

i have wpf application output log log file. log file being written to. want display contents of log file textblock on ui

 <textblock style="{staticresource logviewstyle}"                         text="{binding logmessage,relativesource={relativesource mode=findancestor,ancestortype=window}}"                        x:name="logview" foreground="white"                         fontfamily="consolas"                         rendertransformorigin="0.415,0.382"                         grid.columnspan="2" margin="10,172,10,0"/> 

the code shown below. somehow textblock not getting updated. doing wrong?

public partial class mainwindow : window, inotifypropertychanged     {         static string configfile = "si_config.yaml";          static string logfilepath = "c:\\si_data\\logs\\";         notifyicon nicon = new notifyicon();          public mainwindow()         {             initializecomponent();              myv v = configfilemanager.createtvfromconfigfile(configfile, logfilepath);             list<myv> fv = configfilemanager.createfvfromconfigfile(configfile, logfilepath);              readfile(logfilepath + "ms_interface.log");              fvdatabinding.itemssource = fightervehicles;         }          private string _filetext;         public string filetext {                         {                 return _filetext;             }             set {                 if (string.equals(value, _filetext))                     return;                 _filetext = value;                 onpropertychanged("filetext");             }         }         public void readfile(string path)         {             filetext = file.readalltext(path);             onpropertychanged("filetext");         }           //inotifypropertychanged members         public event propertychangedeventhandler propertychanged;          protected virtual void onpropertychanged(string propertyname)         {             var handler = propertychanged;             if (handler != null)                 handler(this, new propertychangedeventargs(propertyname));         }           private void fvdatabinding_selectionchanged(object sender, selectionchangedeventargs e)         {          }      } } 

bind filetext property:

<textblock style="{staticresource logviewstyle}"                         text="{binding filetext, relativesource={relativesource mode=findancestor,ancestortype=window}}"                        x:name="logview" foreground="white"                         fontfamily="consolas"                         rendertransformorigin="0.415,0.382"                         grid.columnspan="2" margin="10,172,10,0"/> 

it 1 set in readfile method. there no property called logmessage.

and don't have set datacontext of window since specifying source of binding explicitly.