c# - insert data using WriteToServer method datetime column gives exception -


i trying insert datetime column data type datetime. value assigned using datetime.now, know there isn't issue incorrect types in code.

the exception is:

the given value of type string data source cannot converted type datetime of specified target column.

this how specifying datatable columns:

datatable hodetails = new datatable(); hodetails.columns.add("masterid", typeof(long)); hodetails.columns.add("itemid", typeof(int)); hodetails.columns.add("subcategoryid", typeof(int)); hodetails.columns.add("batchno", typeof(string)); hodetails.columns.add("expirydate", typeof(datetime));

and here how setting data:

hodetails.rows[hodetails.rows.count - 1]["itemid"] = convert.toint32(lblitemid.text); hodetails.rows[hodetails.rows.count - 1]["masterid"] =horeceipt_id; hodetails.rows[hodetails.rows.count - 1]["subcategoryid"] = subcatid; hodetails.rows[hodetails.rows.count - 1]["batchno"] = convert.tostring(txtbatchno.text == "" ? "" : txtbatchno.text); hodetails.rows[hodetails.rows.count - 1]["expirydate"] = datetime.now;

so why writetoserver() think "value of type string data source cannot converted type datetime"?

my problem solved change writetoserver method 

                if (dtwithtablename.rows.count > 0)                 {                 using (sqlbulkcopy s = new sqlbulkcopy(strconnection))                 {                  try                 {                     s.destinationtablename = "homaterialreceiptdetails";                     s.columnmappings.add("masterid", "masterid");                     s.columnmappings.add("itemid", "itemid");                     s.columnmappings.add("subcategoryid", "subcategoryid");                     s.columnmappings.add("expirydate", "expirydate");                     s.columnmappings.add("brandname", "brandname");                     s.columnmappings.add("qty", "qty");                     s.columnmappings.add("freeqty", "freeqty");                     s.columnmappings.add("returnqty", "returnqty");                     s.columnmappings.add("replacementqty", "replacementqty");                     s.writetoserver(dtwithtablename);                 }                 catch (exception)                 {                      isinserted = false;                 }              }         }

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