wpf - DispatchHelper open new window -


i using dispatchhelper mvvm light open new window while calculation being performed. window contains simple label , button. when use show() method window appear when calculation starts , close when calculation ends label , button not in window.

i have tried using showdialog() method before calculation starts , show label , button on window. however, showdialog doesn't return until window gets closed. therefore, window stay open , calculation not performed.

would have advise on how work through issue?

public relaycommand showpopupcontrol {         {         return _showpopupcontrol              ?? (_showpopupcontrol = new relaycommand(                 () => {                                             dispatcherhelper.checkbegininvokeonui(() =>                     {                         var ww = new workingwindow();                         ww.showdialog();                         var loop = new loopdata();                         loop.dosomeloops();                         ww.close();                      });                                                     }));     } }  public class loopdata {          public void dosomeloops()     {                   (int = 0; < 10000; i++)         {             system.diagnostics.debug.writeline(i);         }      } }  <controls:metrowindow     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     xmlns:custom="http://metro.mahapps.com/winfx/xaml/controls"      xmlns:d="http://schemas.microsoft.com/expression/blend/2008"      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"      mc:ignorable="d"      x:class="metrospinnerpractice.workingwindow"   xmlns:controls="clr-namespace:mahapps.metro.controls;assembly=mahapps.metro"     title="workingwindow" height="200" width="300"> <grid>     <grid.rowdefinitions>         <rowdefinition height="*"/>         <rowdefinition height="*"/>     </grid.rowdefinitions>        <stackpanel horizontalalignment="center" height="75" margin="5" grid.row="0" verticalalignment="center" width="275" orientation="horizontal">                 <label content="working...."                  verticalalignment="center"                  margin="60,20,0,20"                  fontsize="21.333"                  horizontalalignment="right"                  width="120"                  height="40"/>     </stackpanel>      <button x:name="btncancelwork" grid.row="1"             content="cancel"              width="100"              height="20"              horizontalalignment="center"              verticalalignment="center"              margin="0"              tooltip="cancel current routine"/>  </grid>


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