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        public double this[int index]
        {
            get
            {
                switch (index)
                {
                    case 0:
                        return x;
                    case 1:
                        return y;

mariusz

        public double this[int index]
        {
            get
            {
                switch (index)
                {
                    case 0:
                        return x;
                    case 1:
                        return y;

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        public override bool Equals(object obj)
        {
            CustomPoint point = (CustomPoint)obj;
            if(point == null)
            {
                return false;
            }

            if(this.x == point.x && this.y == point.y)
            {

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    [XmlRoot()]
    public class InputData
    {
      ...
    }

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        public void GenerateGrid(int quantityX, int quantityY)
        {
            this.divX = quantityX + 1;
            this.divY = quantityY + 1;

            int nodesQuantity = this.divX * this.divY;

            float maxWidth = GetStringWidth(nodesQuantity.ToString()) * 1.7f;

            this.offsetY = maxWidth;

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        public static int AddProject(string name, string data)
        {
            ProjectsTableAdapters.ProjectsTableAdapter adapter = new Preprocessor.ProjectsTableAdapters.ProjectsTableAdapter();
            ProjectsDataTable table = adapter.GetData();
            ProjectsRow row = table.NewProjectsRow();
            row.Name = name;
            row.Data = data;

            table.Rows.Add((DataRow)row);
          

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        private void goButton_Click(object sender, EventArgs e)
        {
            if (!CheckErrors())
            {
                return;
            }

            string data = GetProjectData();

            System.IO.StreamWriter writer = new System.IO.StreamWriter("input.xml", false, Encoding.UTF8);

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        private Dictionary<Side, double> GetValuesForSecondBoundry()
        {
            Dictionary<Side, double> dict = new Dictionary<Side, double>();
            List<Side> sides = EnumToList<Side>();

            for (int i = 0; i < this.SideAreaSecondConditionsList.Items.Count; i++)
            {
                int id = int.Parse(this.SideAreaSecondConditionsList.Items[i].SubItems[2].Text);
                dict.Add(sides[id], getValueAsDouble(this.SideAreaSecondConditionsList.Items[i].SubItems[1].Text));
            }

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        public static List<T> EnumToList<T>()
        {
            Type enumType = typeof(T);

            if (enumType.BaseType != typeof(Enum))
                throw new ArgumentException("T must be of type System.Enum");

            Array enumValArray = Enum.GetValues(enumType);

            List<T> enumValList = new List<T>(enumValArray.Length);

mariusz

        public double[][] MatrixH
        {
            get
            {
                if (matrixH != null)
                {
                    return (double[][])matrixH;
                }

                double[][] he = new double[3][];