c# - Updating DataSource of DataGridView - old rows not removed -

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i have application datagridview. use sqlite database , set table datasource datagridview: i'm getting dataset using sqlitedataadapter , setting datasource:

grid.autogeneratecolumns = false; grid.datasource = ds.tables[0].defaultview;   grid.columns["criteriaid"].datapropertyname = "rowid"; grid.columns["criterianame"].datapropertyname = "name"; grid.columns["criteriadesc"].datapropertyname = "description"; grid.columns["criteriadirection"].datapropertyname = "direction";

so far seems working want. want update datasource, replacing rows other data dataset got source. wrote:

var originalds = grid.datasource dataview; var originaltable = originalds.table; originaltable.rows.clear();  foreach (datarow row in ds.tables[0].rows) {        var newrow = originaltable.rows.add();      foreach (datacolumn column in ds.tables[0].columns)     {         object item = row[column];         var columnname = column.columnname;         if (originaltable.columns[columnname] != null)         {             newrow[columnname] = item;         }     } }

still, works expected, rows in datagridview replaced new data. but. trying update underlying database these changes, calling:

var cmdb = new sqlitecommandbuilder(adapter); adapter.updatecommand = cmdb.getupdatecommand();  var cm = (currencymanager)grid.bindingcontext[grid.datasource, grid.datamember]; cm.endcurrentedit();  grid.endedit(); adapter.update(ds.tables[0]);

where adapter sqlitedataadapter used read data db first. , here i'm stuck problem: instead of deleting previous data , saving new rows database, previous records still in database , new rows new datasource added. it's adding , not replacing rows. in line above adapter.update(ds.tables[0]); when debug can see ds.tables[0] has rows new source. why aren't old rows deleted? can make work?

deletng rows db works when delete rows in datagridview manually using gui , save same way database.

any ideas?


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