How to save Multiple textbox values in diferrent-2 Rows in Database

class MultiPleValues
    {
        DataTable dt;

        private void Insert()
        {
            try
            {
                dt = GetDataTable();

                //You can use following in loop. or as your requirement.
                DataRow dr = dt.NewRow();
                dr.BeginEdit();
                dr["S_NO"] = "You Values";
                dr["Name"] = "Your Name";
                dr.EndEdit();
                dt.Rows.Add(dr);


                //After your work compeletition.
                //Insert dt in database useing following method:

                string strQuer = "Select * from --Your Table Name Here";
               dt =  InsertQuery(strQuer, dt);      //this will insert your values in db and also select modified values
            }
            catch (Exception)
            {
                
                throw;
            }
        }

        private DataTable GetDataTable()
        {
            try
            {
                DataTable dtTemp = new DataTable();
                dtTemp.Columns.Add("S_NO");
                dtTemp.Columns.Add("Name");
                return dtTemp;
            }
            catch (Exception)
            {

                throw;
            }
        }


        public static DataTable InsertQuery(string SelectQuery, DataTable dt)
        {
            try
            {
                SqlConnection sqlconn = new SqlConnection("Your Connection String here");
                //this function will insert changes in DB, also select updated values.
                sqlconn.Open();
                SqlCommand sqlcommand = new SqlCommand(SelectQuery, sqlconn);
                SqlDataAdapter adapter = new SqlDataAdapter(sqlcommand);
                SqlCommandBuilder cmdBuilder = new SqlCommandBuilder(adapter);
                cmdBuilder.ConflictOption = ConflictOption.OverwriteChanges;
                adapter.Update(dt);
                return dt;
            }
            catch (Exception)
            {

                throw;
            }
        }
    }