Issue Populating the details view grid with selectedindex gridview - ASP.NET , C# -

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on asp.net page have dropdown list - contains table names db. on selecting 1 table list, gridview below populated information found in table.

some of tables have plenty of columns , making impossible view, l included details view me view columns.

on selecting row in gridview, details view populated rows data. each table has different column names , numbers, facing problem detailsview not populated , when l click 'edit' or 'delete'. gives error events not handled. pointers/help appreciated. should able ot edit information, update in gridview , in turn updating in table.

here code populating detailsview 

protected void gridview1_selectedindexchanged(object sender, eventargs e)     {          dtvinformation.datasource = gridview1.selectedrow.tostring();         dtvinformation.databind();      }

below code populating gridview

protected void dropdownlist1_selectedindexchanged (object sender, eventargs e)  {        sqldataadapter da = new sqldataadapter(string.format ("select * {0}", drptable.selectedvalue), con); dataset ds = new dataset (); da.missingschemaaction = missingschemaaction.addwithkey; da.fill(ds);  gridview1.datasource = ds.tables[0]; gridview1.databind();  }





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