I Want To Create Quadtree

I create Quad tree code . I want to get 10 point from database and put them in Quad tree’s leaves but it doesn’t work correctly.for example random point is (449.6745,411.1505) and range detected is 88 < x < 89 and 411 < y < 412 but it isn’t correct . range should be 449 < x < 450 and 411 < y < 412 . Thanks Here is my code:

public class QuadTree
{
    public TreeNode MainRoot;             
    bool Switch = false;                         
 
    public QuadTree(Rectangle R)          
    {
        MainRoot = new TreeNode();
        MainRoot.Rectangle = R;
        MainRoot.LeftChild = null;
        MainRoot.RightChild = null;
    }
 
    public void CreateTree(TreeNode Root, Rectangle R, bool Switch)
    {
        if (Root.Rectangle.Width <=1 && Root.Rectangle.Height <=1 )
        {
            return;
        }
        Root.LeftChild = new TreeNode();
        Root.RightChild = new TreeNode();
        if (!Switch)
        {
            Root.LeftChild.Rectangle = new Rectangle(R.X, R.Y, R.Width / 2, R.Height);
            Root.RightChild.Rectangle = new Rectangle(R.X + R.Width / 2, R.Y, R.Width / 2, R.Height);
        }
 
        if (Switch)
        {
            Root.LeftChild.Rectangle = new Rectangle(R.X, R.Y, R.Width, R.Height / 2);
            Root.RightChild.Rectangle = new Rectangle(R.X, R.Y - R.Height / 2, R.Width, R.Height / 2);
        }
 
        CreateTree(Root.LeftChild, Root.LeftChild.Rectangle, !Switch);
        CreateTree(Root.RightChild, Root.RightChild.Rectangle, !Switch);
    }
 

    //*****************************************************************************************

 
    double x, y;
    public void SearchPoint(TreeNode Root)
    {
        bool sw = false;
 
        SqlConnection scon = new SqlConnection("Data Source=GATEWAY-PC;Initial Catalog=QuadTree;Integrated Security=True");
        scon.Open();
        SqlCommand scom = new SqlCommand("delete from PointArea", scon);
        scom.ExecuteNonQuery();
 
        for (int i = 1; i <= 10; i++)
        {
            TreeNode Current = new TreeNode();
            TreeNode T = new TreeNode();
            T = Root;
            Current = Root;
            SqlDataReader s = new SqlCommand("select X,Y from Coordinate where ID='" + i + "'", scon).ExecuteReader();
            while (s.Read())
            {
                x = Convert.ToDouble(s["X"]);
                y = Convert.ToDouble(s["Y"]);
            }
            s.Close();
 
            while (Current != null /*&& (Current.Rectangle.Width > 1 || Root.Rectangle.Height > 1)*/)
            {
                if (!sw)
                {
                    if (x >= Current.Rectangle.X && x <= (Current.Rectangle.X + Current.Rectangle.Width / 2))
                    {
                        T = Current;
                        Current = Current.LeftChild;
 
                    }
                    else if (x >= (Current.Rectangle.X + Current.Rectangle.Width / 2) && x <= Current.Rectangle.X + Current.Rectangle.Width)
                    {
                        T = Current;
                        Current = Current.RightChild;
                    }
                }
                if (sw)
                {
 
                    if (y <= Current.Rectangle.Y && y >= (Current.Rectangle.Y - Current.Rectangle.Height / 2))
                    {
                        T = Current;
                        Current = Current.LeftChild;
                    }
                    else if (y <= (Current.Rectangle.Y - Current.Rectangle.Height / 2) && y >= Current.Rectangle.Y - Current.Rectangle.Height)
                    {
                        T = Current;
                        Current = Current.RightChild;
                    }
                }
                sw = !sw;
            }
            SqlCommand sq = new SqlCommand("insert into PointArea values('" + i + "','" + T.Rectangle.X + "','" + (T.Rectangle.X + T.Rectangle.Width) + "','" + (T.Rectangle.Y - T.Rectangle.Height) + "' ,'" + T.Rectangle.Y + "')", scon);
            sq.ExecuteNonQuery();
            T.PointX = x;
            T.PointY = y;
        }
        scon.Close();
 
    }