sqlServer导出到excel

public void toDb(string fileName)         {             string execelConnectionStr = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileName + @";Extended Properties=""Excel 8.0;HDR=YES;""";             try             {                 using (OleDbConnection conn = new OleDbConnection(execelConnectionStr))                 {                     OleDbCommand cmd = new OleDbCommand("select * FROM [Sheet1$]",conn);                     conn.open();                     using (DbDataReader dr = cmd.ExecuteReader())                     {                         string sqlConnectionString = @"Data Source=数据库服务器;Initial Catalog=数据库名;Persist Security Info=True;User ID=sa;Password=123";                         // Bulk copy to sql Server                         using (sqlBulkcopy bulkcopy = new sqlBulkcopy(sqlConnectionString))                         {                             bulkcopy.DestinationTableName = "E003";                             bulkcopy.WritetoServer(dr);                         }                     }                 }             }             catch (Exception ex)             {                 ex.ToString();             }         }