c# - Get selected record from datagrid wpf? -

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i've got table in picture. according post field checkbox , if checked write file , delete records database. if not checked records remain in database.problem when try access records exception(cant find onject) because trying access datagrid.selectedindex giving me datagrid index , not record index. there way of getting record index? ve got automatic index incremented 1 unique id each record.

enter image description here

thanks in advance

if use viewmodel or can use command , selected datagridrow commandparameter. in command can access underlining data , check "post" property , wirte file , delete row collection.

<buttons command="{binding writecommand}" commandparameter="{binding elementname=mydatagridctrl, path=selecteditem}" />

if have datatable datasource command following

 private delegatecommand<datarowview> _writecommand ;  public icommand writecommand     {                 {             return this._writecommand ??                    (this._writecommand = new delegatecommand<datarowview>(this.writecommandexecute, this.canwritecommandexecute));         }     }   private bool caneditdatacommandexecute(datarowview rowtowrite)     {         return rowtowrite!= null && (bool)rowtowrite["post"];//if post bool     }    private void editdatacommandexecute(datarowview rowtowrite)     {         if (!this.caneditdatacommandexecute(rowtowrite))             return;          //do stuff here     }

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