c# - the text of datagridview disappears -


i using telerik control(data grid view) in project. when want add new row in data grid, text of previous rows (bindingsourceservice.datasource = dtservice , bindingsourceunit.datasource = dtunit) disappear. datagridview has 3 combobox column. wrong? please me.

my codes:

public void factorload(object sender, eventargs e)         {             try             {                 var cb = new categoribll();                datatable dtcategori = cb.getalldatacategori();                bindingsourcecategouri.datasource = dtcategori;             }             catch (exception ex)             {                exceptionkeeperbll.logfilewrite(ex);             } }    private void datagridviewfactorcellvaluechanged(object sender, gridviewcelleventargs e)         {             try             {                 var row = datagridviewfactor.currentrow;                 if ((row != null) && (row.cells[0].iscurrent))                 {                     var categoryid = convert.toint32(datagridviewfactor.currentrow.cells[0].value);                     var sb = new categorioptionbll();                     datatable dtservice = sb.servicegetbyid(categoryid);                     bindingsourceservice.datasource = dtservice;                 }                 if ((row != null) && (row.cells[1].iscurrent))                 {                     var serviceid = convert.toint32(datagridviewfactor.currentrow.cells[1].value);                     var cbi = new costbll();                     var dtunit = cbi.costbyid(serviceid);                     bindingsourceunit.datasource = dtunit;                 }             }             catch (exception ex)             {                 exceptionkeeperbll.logfilewrite(ex);             }         }          private void datagridviewfactorcelleditorinitialized(object sender, gridviewcelleventargs e)         {             try             {                 var row = datagridviewfactor.currentrow;                 if ((row != null) && (row.cells[0].iscurrent))                 {                     var categoryid = convert.toint32(datagridviewfactor.currentrow.cells[0].value);                     var sb = new categorioptionbll();                     datatable dtservice = sb.servicegetbyid(categoryid);                     bindingsourceservice.datasource = dtservice;                 }                 if ((row != null) && (row.cells[1].iscurrent))                 {                     var serviceid = convert.toint32(datagridviewfactor.currentrow.cells[1].value);                     var cbi = new costbll();                     var dtunit = cbi.costbyid(serviceid);                     bindingsourceunit.datasource = dtunit;                 }             }             catch (exception ex)             {                 exceptionkeeperbll.logfilewrite(ex);             }         }

it disappear because there 1 value in data source. try adding value data source rather assigning single value.


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