private void InitializeComponent()
        {
            this.flyGrid1 = new NineRays.Windows.Forms.FlyGrid();
            this.column1 = new NineRays.Windows.Forms.Grids.Column();
            this.button1 = new System.Windows.Forms.Button();
            this.txt = new System.Windows.Forms.TextBox();
            ((System.ComponentModel.ISupportInitialize)(this.flyGrid1)).BeginInit();
            this.SuspendLayout();
            //
            // flyGrid1
            //
            //
            //
            //
            this.flyGrid1.Columns.Items.AddRange(new NineRays.Windows.Forms.Grids.Column[] {
            this.column1});
            this.flyGrid1.Location = new System.Drawing.Point(13, 13);
            this.flyGrid1.Name = \"flyGrid1\";
            this.flyGrid1.Opacity = 1;
            this.flyGrid1.Options = ((NineRays.Windows.Forms.Grids.GridOptions)((NineRays.Windows.Forms.Grids.GridOptions.ReadOnly | NineRays.Windows.Forms.Grids.GridOptions.Default)));
            this.flyGrid1.Size = new System.Drawing.Size(267, 241);
            this.flyGrid1.TabIndex = 0;
            this.flyGrid1.Text = \"flyGrid1\";
            //
            // column1
            //
            this.column1.AllowFiltering = true;
            this.column1.Caption = \"Column 1\";
            this.column1.ImageKey = null;
            this.column1.State = NineRays.Windows.Forms.Grids.ColumnState.DropDownBtnUp;
            this.column1.Width = 150;
            //
            // button1
            //
            this.button1.Location = new System.Drawing.Point(575, 281);
            this.button1.Name = \"button1\";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 1;
            this.button1.Text = \"button1\";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            //
            // txt
            //
            this.txt.Location = new System.Drawing.Point(469, 283);
            this.txt.Name = \"txt\";
            this.txt.Size = new System.Drawing.Size(100, 20);
            this.txt.TabIndex = 2;
            this.txt.Text = \"10\";
            //
            // Form1
            //
            this.AcceptButton = this.button1;
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(662, 316);
            this.Controls.Add(this.txt);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.flyGrid1);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.Name = \"Form1\";
            this.Text = \"Form1\";
            this.Load += new System.EventHandler(this.Form1_Load);
            ((System.ComponentModel.ISupportInitialize)(this.flyGrid1)).EndInit();
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        private NineRays.Windows.Forms.FlyGrid flyGrid1;
        private NineRays.Windows.Forms.Grids.Column column1;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.TextBox txt;

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            flyGrid1.VirtualMode_GetCount += new GetCountHandler(flyGrid1_VirtualMode_GetCount);
            flyGrid1.VirtualMode_GetNodeCellValue += new GetCellValueHandler(flyGrid1_VirtualMode_GetNodeCellValue);
            flyGrid1.Rows.VirtualMode = true;
        }

        object flyGrid1_VirtualMode_GetNodeCellValue(object sender, NodeBase node, int index)
        {
            return 99;
        }

        int flyGrid1_VirtualMode_GetCount(NodeBase sender)
        {
            return Convert.ToInt32(txt.Text);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            flyGrid1.Rows.Reset();
            flyGrid1.Rows.RootNode = null;
            flyGrid1.Invalidate();
        }
    }

        int counter = 0;
        int flyGrid1_VirtualMode_GetCount(NodeBase sender)
        {
            //return Convert.ToInt32(txt.Text); <----- !~!~!~!~!~!~BAD BAD CODE~!~!~!~!~!~!
            return counter;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            counter = Convert.ToInt32(txt.Text);

            flyGrid1.Rows.Reset();
            flyGrid1.Invalidate();
        }

1. can GetCount be optimised?

2. can you implement GetNodeValue instead (for a case when you use virtual grid mostly in full length wherefore whole row is visible. in such a case I believe you can increase efficiency not picking every cell but sending a whole data row into grid to display)