CNSA-212-Personal/Database3/StudentDataTier.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.VisualBasic;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Data.SqlClient;


namespace Database3
{
    public class StudentDataTier
    {
        static String connString = ConfigurationManager.ConnectionStrings["ConnString"].ConnectionString;
        static SqlConnection myConn = new SqlConnection(connString);
        static System.Data.SqlClient.SqlCommand cmdString = new System.Data.SqlClient.SqlCommand();
        
        public DataSet GetStudents(string studid, string lname, DateTime dob)
        {
            try
            {
                // open connection
                myConn.Open();
                //clear any parameters
                cmdString.Parameters.Clear();
                // command
                cmdString.Connection = myConn;
                cmdString.CommandType = CommandType.StoredProcedure;
                cmdString.CommandTimeout = 1500;
                cmdString.CommandText = "SearchStudent";
                // Define input parameter
                cmdString.Parameters.Add("@studentid", SqlDbType.VarChar, 6).Value = studid;
                cmdString.Parameters.Add("@lname", SqlDbType.VarChar, 25).Value = lname;
                cmdString.Parameters.Add("@dob", SqlDbType.Date).Value = dob;
                // adapter and dataset
                SqlDataAdapter aAdapter = new SqlDataAdapter();
                aAdapter.SelectCommand = cmdString;
                DataSet aDataSet = new DataSet();
        
                // fill adapter
                aAdapter.Fill(aDataSet);
        
                // return dataSet
                return aDataSet;
            }
            catch (Exception ex)
            {
                throw new ArgumentException(ex.Message);
            }
            finally
            {
                myConn.Close();
            }
        }


        public DataSet GetStudents(string StuID)
        {
            
            
                try
                {
                    // open connection
                    myConn.Open();
                    //clear any parameters
                    cmdString.Parameters.Clear();
                    // command
                    cmdString.Connection = myConn;
                    cmdString.CommandType = CommandType.StoredProcedure;
                    cmdString.CommandTimeout = 1500;
                    cmdString.CommandText = "GetByStudentIDS";
                    // Define input parameter
                    cmdString.Parameters.Add("@studentid", SqlDbType.VarChar, 6).Value = StuID;
                    // adapter and dataset
                    SqlDataAdapter aAdapter = new SqlDataAdapter();
                    aAdapter.SelectCommand = cmdString;
                    DataSet aDataSet = new DataSet();
        
                    // fill adapter
                    aAdapter.Fill(aDataSet);
        
                    // return dataSet
                    return aDataSet;
                }
                catch (Exception ex)
                {
                    throw new ArgumentException(ex.Message);
                }
                finally
                {
                    myConn.Close();
                }
        }
    }
    

}