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    partial class Form1
    {
        /// <summary>
        /// Erforderliche Designervariable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Verwendete Ressourcen bereinigen.
        /// </summary>
        /// <param name="disposing">True, wenn verwaltete Ressourcen gelöscht werden sollen; andernfalls False.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Vom Windows Form-Designer generierter Code

        /// <summary>
        /// Erforderliche Methode für die Designerunterstützung.
        /// Der Inhalt der Methode darf nicht mit dem Code-Editor geändert werden.
        /// </summary>
        private void InitializeComponent()
        {
            this.dataGridView1 = new System.Windows.Forms.DataGridView();
            ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit();
            this.SuspendLayout();
            // 
            // dataGridView1
            // 
            this.dataGridView1.AllowUserToAddRows = false;
            this.dataGridView1.AllowUserToDeleteRows = false;
            this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
            this.dataGridView1.Location = new System.Drawing.Point(12, 12);
            this.dataGridView1.Name = "dataGridView1";
            this.dataGridView1.RowHeadersWidthSizeMode = System.Windows.Forms.DataGridViewRowHeadersWidthSizeMode.DisableResizing;
            this.dataGridView1.Size = new System.Drawing.Size(240, 150);
            this.dataGridView1.TabIndex = 0;
            this.dataGridView1.VirtualMode = true;
            this.dataGridView1.CellValueChanged += new System.Windows.Forms.DataGridViewCellEventHandler(this.dataGridView1_CellValueChanged);
            this.dataGridView1.CellValueNeeded += new System.Windows.Forms.DataGridViewCellValueEventHandler(this.dataGridView1_CellValueNeeded);
            this.dataGridView1.RowsAdded += new System.Windows.Forms.DataGridViewRowsAddedEventHandler(this.dataGridView1_RowsAltered);
            this.dataGridView1.ColumnAdded += new System.Windows.Forms.DataGridViewColumnEventHandler(this.dataGridView1_ColumnsAltered);
            this.dataGridView1.ColumnRemoved += new System.Windows.Forms.DataGridViewColumnEventHandler(this.dataGridView1_ColumnsAltered);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(292, 273);
            this.Controls.Add(this.dataGridView1);
            this.Name = "Form1";
            this.Text = "Form1";
            ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).EndInit();
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.DataGridView dataGridView1;
    }

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            dataGridView1.ColumnCount = 4;
            dataGridView1.RowCount = 4;
        }

        private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
        {
            System.Console.WriteLine(sender.ToString() + ": " + e.ToString());
        }

        private void dataGridView1_CellValueNeeded(object sender, DataGridViewCellValueEventArgs e)
        {
            e.Value = e.ColumnIndex.ToString() + "," + e.RowIndex.ToString();
        }

        private void dataGridView1_ColumnsAltered(object sender, DataGridViewColumnEventArgs e)
        {
            e.Column.HeaderText = e.Column.Index.ToString();
        }

        private void dataGridView1_RowsAltered(object sender, DataGridViewRowsAddedEventArgs e)
        {
            ((DataGridView)sender).Rows[e.RowIndex].Cells[0].Value = e.RowIndex.ToString();
        }
    }                    

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        //--------------------------------------------------------------------------------------------------
        //Events for the DataGridView
        private void DGV_CellValueChanged(object sender, DataGridViewCellEventArgs e)
        {
            int x = e.ColumnIndex;
            int y = e.RowIndex;

            //Inside the header
            if (y < 0)
            {
                return;
            }

            double v = (double)((DataGridView)sender).Rows[y].Cells[x].Value;

            if (x >= Matrix.width || y >= Matrix.height || x < 0 || y < 0)
            {
                System.Console.WriteLine("Change at " + x.ToString() + "," + y.ToString() + ": " + v.ToString());
                return;
            }
            else
            {
                Matrix.data[y, x] = v;
            }
            
            doMatrixChange();
        }

        private void DGV_CellValueNeeded(object sender, DataGridViewCellValueEventArgs e)
        {
            int x = e.ColumnIndex;
            int y = e.RowIndex;

            if (x >= Matrix.width || y >= Matrix.height || x < 0 || y < 0)
            {
                e.Value = null;
            }
            else
            {
                e.Value = Matrix.data[y, x];
            }
        }

        private void DGV_ColumnsAltered(object sender, DataGridViewColumnEventArgs e)
        {
            e.Column.HeaderText = e.Column.Index.ToString();
            e.Column.Width = 65;

            //            ((DataGridView)sender).Width = ((DataGridView)sender).RowHeadersWidth + ((DataGridView)sender).ColumnCount * ((DataGridView)sender).Columns.GetColumnsWidth(DataGridViewElementStates.Visible);
        }

        private void DGV_RowsAltered(object sender, DataGridViewRowsAddedEventArgs e)
        {
            //            ((DataGridView)sender).Height = ((DataGridView)sender).ColumnHeadersHeight + ((DataGridView)sender).RowCount * ((DataGridView)sender).RowTemplate.Height;
        }

        /// <summary>
        /// draw the row number on the header cell, auto adjust the column width
        /// to fit the row number
        /// </summary>
        /// <param name="e"></param>
        private void DGV_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            DataGridView dgv = (DataGridView)sender;

            // get the row number in leading zero format, 
            //  where the width of the number = the width of the maximum number
            int RowNumWidth = dgv.RowCount.ToString().Length;
            String RowNumber = (e.RowIndex + 1).ToString();

            // get the size of the row number string
            SizeF Sz = e.Graphics.MeasureString(RowNumber, dgv.Font);

            // adjust the width of the column that contains the row header cells 
            if (dgv.RowHeadersWidth < (int)(Sz.Width + 20))
                dgv.RowHeadersWidth = (int)(Sz.Width + 20);

            // draw the row number
            e.Graphics.DrawString(
                RowNumber.ToString(),
                dgv.Font,
                SystemBrushes.ControlText,
                e.RowBounds.Location.X + dgv.RowHeadersWidth - 3 - Sz.Width,
                e.RowBounds.Location.Y + ((e.RowBounds.Height - Sz.Height) / 2));
        }                    

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            // 
            // dataGridView1
            // 
            this.dataGridView1.AllowUserToAddRows = false;
            this.dataGridView1.AllowUserToDeleteRows = false;
            this.dataGridView1.AllowUserToResizeColumns = false;
            this.dataGridView1.AllowUserToResizeRows = false;
            dataGridViewCellStyle1.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(224)))), ((int)(((byte)(224)))), ((int)(((byte)(224)))));
            this.dataGridView1.AlternatingRowsDefaultCellStyle = dataGridViewCellStyle1;
            this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
            this.dataGridView1.Location = new System.Drawing.Point(3, 3);
            this.dataGridView1.MultiSelect = false;
            this.dataGridView1.Name = "dataGridView1";
            this.dataGridView1.RowHeadersWidthSizeMode = System.Windows.Forms.DataGridViewRowHeadersWidthSizeMode.DisableResizing;
            this.dataGridView1.Size = new System.Drawing.Size(240, 150);
            this.dataGridView1.TabIndex = 1;
            this.dataGridView1.VirtualMode = true;
            this.dataGridView1.CellValueChanged += new System.Windows.Forms.DataGridViewCellEventHandler(this.DGV_CellValueChanged);
            this.dataGridView1.RowPostPaint += new System.Windows.Forms.DataGridViewRowPostPaintEventHandler(this.DGV_RowPostPaint);
            this.dataGridView1.CellValueNeeded += new System.Windows.Forms.DataGridViewCellValueEventHandler(this.DGV_CellValueNeeded);
            this.dataGridView1.RowsAdded += new System.Windows.Forms.DataGridViewRowsAddedEventHandler(this.DGV_RowsAltered);
            this.dataGridView1.ColumnAdded += new System.Windows.Forms.DataGridViewColumnEventHandler(this.DGV_ColumnsAltered);
            this.dataGridView1.ColumnRemoved += new System.Windows.Forms.DataGridViewColumnEventHandler(this.DGV_ColumnsAltered);