CNSA-216-Personal/CH78/StudentDataTier.cs

using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Web.UI.WebControls;

namespace CH78
{
    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();
        
        private void BindData()
        {
            
            
            
        }

        protected void grdStudnet_RowDataBind(object sender, GridViewRowEventArgs e)
        {
            
            if (e.Row.RowType == DataControlRowType.Header) // header add click event to select checkboxes
            {
                ((CheckBox)e.Row.FindControl("cbSelectAll")).Attributes.Add("onclick", "javascript:SelectAll('" + ((CheckBox)e.Row.FindControl("cbSelectAll")).ClientID + "')");
            }

            
        }
        
        public DataSet GetStudents()
        {
            
            
            try
            {
                // open connection
                myConn.Open();
                //clear any parameters
                cmdString.Parameters.Clear();
                // command
                cmdString.Connection = myConn;
                cmdString.CommandType = CommandType.StoredProcedure;
                cmdString.CommandTimeout = 1500;
                cmdString.CommandText = "GetAllStudents";
                // 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 static DataSet GetStates()
        {
            
            
            try
            {
                // open connection
                myConn.Open();
                //clear any parameters
                cmdString.Parameters.Clear();
                // command
                cmdString.Connection = myConn;
                cmdString.CommandType = CommandType.StoredProcedure;
                cmdString.CommandTimeout = 1500;
                cmdString.CommandText = "GetAllStates";
                // 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 static DataSet SearchStudents(string fname, string lname, 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 = "SEARCHSTUDENT2";

                cmdString.Parameters.Add("@studentid", SqlDbType.VarChar, 6).Value = stuID;
                cmdString.Parameters.Add("@fname", SqlDbType.VarChar, 25).Value = fname;
                cmdString.Parameters.Add("@lname", SqlDbType.VarChar, 25).Value = lname;
                
                // 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();
            }
        }

    }
}