asp.net - how to do validation in sql bulk copy upload -


i created mvc4 application upload data using excel file store in database table called tbl_hei_student.

    [httppost]     [acceptverbs(httpverbs.post)]     public actionresult student(httppostedfilebase fileupload1)     {                    try         {             string constring = string.empty;             //upload , save file                 if (request.files["fileupload1"].contentlength > 1)             {                 try                 {                     string excelpath = path.combine(httpcontext.server.mappath("~/content/"), path.getfilename(fileupload1.filename));                     fileupload1.saveas(excelpath);                      string extension = path.getextension(fileupload1.filename);                     switch (extension)                     {                         case ".xls": //excel 97-03                             constring = configurationmanager.connectionstrings["excel03constring"].connectionstring;                             break;                         case ".xlsx": //excel 07 or higher                             constring = configurationmanager.connectionstrings["excel07+constring"].connectionstring;                             break;                         default:                             this.setnotification("the file type submitted invalid", notificationenumeration.error);                              return redirecttoaction("student", "excel");                      }                     constring = string.format(constring, excelpath);                   }                     try                 {                     using (oledbconnection excel_con = new oledbconnection(constring))                     {                         excel_con.open();                          datatable dtexceldata = new datatable();                          string query =    "select " +                                           "s1.hec_id, " +                                           "s1.student_personal_id, " +                                                                                    "s1.date_of_birth "  ;                          using (oledbdataadapter oda = new oledbdataadapter(query, excel_con))                         {                             oda.fill(dtexceldata);                         }                          //if (dtexceldata.defaultview.count < 0)                         //    {                         //        throw new exception("your data sheet empty. pleaswe upload another.");                         //    }                          string consstring = configurationmanager.connectionstrings["constr"].connectionstring;                         using (sqlconnection con = new sqlconnection(consstring))                         {                             using (sqlbulkcopy sqlbulkcopy = new sqlbulkcopy(con,                                                         sqlbulkcopyoptions.checkconstraints |                                                         sqlbulkcopyoptions.firetriggers |                                                         sqlbulkcopyoptions.keepnulls |                                                         sqlbulkcopyoptions.tablelock |                                                         sqlbulkcopyoptions.useinternaltransaction |                                                         sqlbulkcopyoptions.keepidentity,                                                         null))                             {                                 //set database table name                                 sqlbulkcopy.destinationtablename = "tbl_hei_student";                                  sqlbulkcopy.bulkcopytimeout = 0;                                    sqlbulkcopy.columnmappings.add("hec_id", "hec_id");                                 sqlbulkcopy.columnmappings.add("student_personal_id", "student_personal_id");                                 sqlbulkcopy.columnmappings.add("date_of_birth", "date_of_birth");                                   con.open();                                                                       {                                     con.close();                                 }                             }                         }                     }                 }                 }             }     }

in table have following fields capture data upload using excel file

column name            | data type  hec_id                 | nvarchar(100)  student_personal_id    | nvarchar(100)       date_of_birth          | datetime

in excel have hundreds of rows ,

i terminate upload action, if 1 data field in wrong format date_of_birth field

before inserting database, fetch variable , check

datetime date = datetime.parseexact(inputstring, formatstring, system.globalization.cultureinfo.invariantculture)

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