c# - Error after setting different datasources for datagridview combobox cells -

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i trying display in datagridview control names , fields of database tables. in every row name of table displayed in first cell, , second column allows choose of fields of table.

to that, handling 'datagridview.cellbeginedit' event , fill datasource cell names of fields. when trying edit cells, provided list displayed correctly , can b chose fine.

however when try same in row, start getting dataerror events cell have edited.

event arguments datarow have 'formatting|display' in context field, , have message "value not allowed in datagridviewcomboboxcell" (or close it). in debug, cell event references has correct value field, datasource null , formattedvalue empty string. , displayed text changes blank.

how should resolved correctly? should derive own custom datagridview cell displays text has combobox editor? if so, how?

edit: here code using:

public class fielddataneededeventargs: eventargs {     public list<string> fieldnames     {         get; private set;     }     public string tablename     {         get; private set;     }     public referencefielddataneededeventargs(stringdata)         : base()     {         fieldnames = new list<string>();         tablename= data;     } }  ...  public event eventhandler<fielddataneededeventargs> fielddataneeded =         new eventhandler<fielddataneededeventargs>((sender, args) => { });  ...     //handler cellbeginedit     //dgvmatch - datagridview, docsreferencetotablematch class datagridview bound     private void dgvmatch_cellbeginedit(object sender, datagridviewcellcanceleventargs e)     {         if (e.columnindex == dgvmatch.columns["tablekey"].index)         {             docsreferencetotablematch data = dgvmatch.rows[e.rowindex].databounditem docsreferencetotablematch;             fielddataneededeventargs ea = new fielddataneededeventargs(data.tablename);             fielddataneeded(this, ea);             var cell = (dgvmatch.rows[e.rowindex].cells[e.columnindex] datagridviewcomboboxcell);             cell.datasource = ea.fieldnames;         }     }     //example handler fielddataneeded event     static void ld_referencefielddataneeded(object sender, referencefielddataneededeventargs e)     {         (int = 0; < 4; i++)         {             e.fieldnames.add(string.format("{0}_fld{1}", e.referencename, i));         }     }


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