c# - How to enable button if item selected in a GridView -

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i want enable button when grid view item selected update gui in metro apps. button include list view item. below code snippet of want do. please help.

<gridview name="searchpanelgrid"  selectionmode="single"                                  horizontalalignment="left"                                 scrollviewer.ishorizontalscrollchainingenabled="true"                                 scrollviewer.isverticalscrollchainingenabled ="true"                                 scrollviewer.horizontalscrollbarvisibility="auto"                                 scrollviewer.verticalscrollbarvisibility="auto"                                 scrollviewer.horizontalscrollmode="enabled"                                 scrollviewer.verticalscrollmode="enabled"                                 itemssource="{binding source={staticresource collectionitems}}" grid.row="2">         <gridview.itemspanel>             <itemspaneltemplate>                 <wrapgrid orientation="horizontal" />             </itemspaneltemplate>         </gridview.itemspanel>         <gridview.itemtemplate>             <datatemplate>                 <grid margin="6" height="175" width="150" background="#fffafafa">                     <grid.rowdefinitions>                         <rowdefinition height="85"/>                         <rowdefinition height="50"/>                         <rowdefinition height="30"/>                     </grid.rowdefinitions>                     <stackpanel background="#ff0a56bf" width="150" height="85" grid.row="0">                         <image source="{binding path=thumnailurl}" stretch="uniformtofill" horizontalalignment="left" verticalalignment="top"/>                     </stackpanel>                     <textblock text="{binding path=videoname}" textwrapping="wrap" foreground="#ff017dd5" grid.row="1" horizontalalignment="left" verticalalignment="top" height="auto" fontsize="12"/>                     <button x:name="downloadbutton" grid.row="3" content="download video" horizontalalignment="left" verticalalignment="bottom" style="{staticresource downloadbuttonstyle}" click="downloadbutton_click" isenabled="{binding}" />                 </grid>             </datatemplate>         </gridview.itemtemplate>     </gridview>

unable bind button property isenabled. suggestion how ??

i have solve declaring property in class collectionitems bind , bind property button isenabled property , on selectionchangeevent selected item of grid view , set button isenabled property value true. working.

xaml file searchpanel.xaml

<gridview name="searchpanelgrid"  selectionmode="single"                                  horizontalalignment="left"                                 scrollviewer.ishorizontalscrollchainingenabled="true"                                 scrollviewer.isverticalscrollchainingenabled ="true"                                 scrollviewer.horizontalscrollbarvisibility="auto"                                 scrollviewer.verticalscrollbarvisibility="auto"                                 scrollviewer.horizontalscrollmode="enabled"                                 scrollviewer.verticalscrollmode="enabled"                                 itemssource="{binding source={staticresource collectionitems}}" grid.row="2" selectionchanged="searchpanelgrid_selectionchanged">         <gridview.itemspanel>             <itemspaneltemplate>                 <wrapgrid orientation="horizontal" />             </itemspaneltemplate>         </gridview.itemspanel>         <gridview.itemtemplate>             <datatemplate>                 <grid margin="6" height="175" width="150" background="#fffafafa">                     <grid.rowdefinitions>                         <rowdefinition height="85"/>                         <rowdefinition height="50"/>                         <rowdefinition height="30"/>                     </grid.rowdefinitions>                     <stackpanel background="#ff0a56bf" width="150" height="85" grid.row="0">                         <image source="{binding path=thumnailurl}" stretch="uniformtofill" horizontalalignment="left" verticalalignment="top"/>                     </stackpanel>                     <textblock text="{binding path=videoname}" textwrapping="wrap" foreground="#ff017dd5" grid.row="1" horizontalalignment="left" verticalalignment="top" height="auto" fontsize="12"/>                     <button x:name="downloadbutton" grid.row="3" content="download video" horizontalalignment="left" verticalalignment="bottom" style="{staticresource downloadbuttonstyle}" click="downloadbutton_click" isenabled="{binding isselected}" />                 </grid>             </datatemplate>         </gridview.itemtemplate>     </gridview>

class bind itemssource propertry of gridview 

public class videoinfo : inotifypropertychanged {     private bool isselected;     public bool isselected     {         { return isselected; }         set         {             isselected = value;             notifypropertychanged("isselected");         }     }      private string thumnailurl;     public string thumnailurl     {         { return thumnailurl; }         set         {             thumnailurl = value;             notifypropertychanged("thumnailurl");         }     }      private string videoname;     public string videoname     {         { return videoname; }         set         {             videoname = value;             notifypropertychanged("videoname");          }     }      public event propertychangedeventhandler propertychanged;      private void notifypropertychanged(string info)     {         if (propertychanged != null)         {             propertychanged(this, new propertychangedeventargs(info));         }     } }

.cs file searchpanel.xaml.cs on selectionchangeevent of gridview

private void searchpanelgrid_selectionchanged(object sender, selectionchangedeventargs e)     {         movieinfo info = (e.addeditems[0]) movieinfo;         info.isselected = true;     }

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