C#

private DataSet CreateDataSet()
   {
        DataColumn[] keys = new DataColumn[1];
        DataSet dsFinalTimeTable = new DataSet();
        DataTable tbldt;

        tbldt = new DataTable("Subjects");
        //Add Staff Table 
        XmlDataDocument xmlDatadocStaff = new XmlDataDocument();
        xmlDatadocStaff.DataSet.ReadXml(@"J:\Pilot Project\App_Data\Subjects.xml");
        tbldt = xmlDatadocStaff.DataSet.Tables["Subjects"];
        keys = new DataColumn[1];
        keys[0] = tbldt.Columns["ID"];
        tbldt.PrimaryKey = keys;
        dsFinalTimeTable.Tables.Add(tbldt.Copy());


        //Add Venue Table 
        tbldt = new DataTable("Venue");
        XmlDataDocument xmlDatadocVenue = new XmlDataDocument();
        xmlDatadocVenue.DataSet.ReadXml(@"J:\Pilot Project\App_Data\XML_Venue.xml");
        tbldt =  xmlDatadocVenue.DataSet.Tables["VENUE"];
        keys = new DataColumn[1];
        keys[0] = tbldt.Columns["ID"];
        tbldt.PrimaryKey = keys;
        
        dsFinalTimeTable.Tables.Add(tbldt.Copy());

       //TimeTable
        tbldt = new DataTable("TimeTable");
        XmlDataDocument xmlDatadocTimeTable = new XmlDataDocument();
        xmlDatadocTimeTable.DataSet.ReadXml(@"J:\Pilot Project\App_Data\TimeTableFull.xml");
        tbldt = xmlDatadocTimeTable.DataSet.Tables[0];
        keys = new DataColumn[1];
        keys[0] = tbldt.Columns["ID"];
        tbldt.PrimaryKey = keys; 
        dsFinalTimeTable.Tables.Add(tbldt.Copy());
        
        
        //Setup RelationsTimeTable//
        DataRelation VenuesRelations = new DataRelation("VenueRel", dsFinalTimeTable.Tables["Venue"].Columns["ID"], dsFinalTimeTable.Tables["Appointment"].Columns["ID"]);
        DataRelation ModuleRelations = new DataRelation("ModuleRel",dsFinalTimeTable.Tables["Subjects"].Columns["ID"],dsFinalTimeTable.Tables["Appointment"].Columns["subjectid"]);
       
        dsFinalTimeTable.Relations.Add(VenuesRelations);
        dsFinalTimeTable.Relations.Add(ModuleRelations);

        return dsFinalTimeTable;
   }

dsFinalTimeTable.Relations.Add(ModuleRelations);

dsFinalTimeTable.EnforceConstraints = false;

List<int> selections=new List<int>();

protected override void OnMouseUp(MouseEventArgs e)
        {
            selections = this.SelectedIndices.Cast<int>().ToList(); //store selection
            this.SelectedIndices.Clear(); //clear selection 

            for (int i = 0; i < this.Items.Count; i++)
            {
                if (this.selections.Contains(i))
                    this.Items[i].BackColor = Color.Blue; //if selected, make it blue
                else
                    this.Items[i].BackColor = Color.White; //if not selected, make it white
            }
            base.OnMouseUp(e);
        }

using System;
using System.Windows.Forms;

namespace WindowsFormsApplication3 {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }

        private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) {
            int i = 0;
        }

        private void Form1_KeyDown(object sender, KeyEventArgs e) {
            int j = 0;
        }

        private void Form1_KeyPress(object sender, KeyPressEventArgs e) {
            int i = 0;
        }

        private void linkLabel1_Click(object sender, EventArgs e) {
            int i = 0;
        }
    }
}