c# - Remove DataTable From DataSet doesn't work -

i have problem "undeletable" datatable.

step 1: create datatable

datatable dt = dtprogpoints_template.clone(); //create table dt.tablename = "program points 0"; //rename dsprogpoints.tables.add(dt); //add dataset dsprogpoints.acceptchanges(); //i found in forum, tried 

step 2: display in datagridview

dtgprogpoints.datasource = dsprogpoints; //dtgprogpoints datagridview dtgprogpoints.datamember = "program points 0"; 

step 3: remove datatable

dsprogpoints.tables.remove("program points 0"); //remove datatable dataset ds.acceptchanges();//i found in forum, tried 

and now, mystery coming.

if check dsprogpoints.tables.count;, table removed, number of tables smaller before removing.

when try delete again, exception occurs.

but when try dtgprogpoints.datamember = "program points 0";, data displayed in datagridview. table still not member of table collection in dataset, because if try read dsprogpoints.tables["program points 0"].rows[0][0] exception fired, because table "program points 0" not member of table collection.

when create again using dsprogpoints.tables.add("program points 0"); table created. means, not exist in dataset

it looks there problem datagridview? tahnk you, pavel