c# - How can I get the DataGridRow from the DataRowView? -

i have created wpf application loads 2 datagrids data sqlclient datatables. have method below compares 2 tables. working fine, must have changed in code broke it. datagridrow1 , datagridrow2 variables null. how can datagridrow datarowview?

    private void comparedatatables(string primarykey)     {         foreach (datarowview datarowview1 in datagrid1.itemssource)         {             datagridrow datagridrow1 = datagrid1.itemcontainergenerator.containerfromitem(datarowview1) datagridrow;             if (datagridrow1 != null)             {                 int primarykeyvalue1 = (int)datarowview1.row[primarykey];                 foreach (datarowview datarowview2 in datagrid2.itemssource)                 {                     //datarowview datarowview2 = (datarowview)datagridrow2.item;                     int primarykeyvalue2 = (int)datarowview2.row[primarykey];                     if (primarykeyvalue1 == primarykeyvalue2)                     {                         foreach (datagridcolumn column in datagrid1.columns)                         {                             datagridrow datagridrow2 = datagrid2.itemcontainergenerator.containerfromitem(datarowview2) datagridrow;                             if (datagridrow2 != null)                             {                                 frameworkelement frameworkelement1 = column.getcellcontent(datagridrow1);                                 frameworkelement frameworkelement2 = getframeworkelement(datagrid2, datagridrow2, (string)column.header);                                 if (frameworkelement1 textblock && frameworkelement2 textblock)                                 {                                     textblock textblock1 = frameworkelement1 textblock;                                     textblock textblock2 = frameworkelement2 textblock;                                     if (textblock1.text != textblock2.text)                                     {                                         textblock1.background = brushes.lightsalmon;                                         textblock2.background = brushes.lightsalmon;                                     }                                 }                             }                         }                         break;                     }                 }             }         }     } 

instead of grid.itemcontainergenerator.containerfromitem, please use grid.itemcontainergenerator.containerfromindex function, because datadrid using virtulization item not generated @ time.