Add New Rows to an existing ASP.Net Table

Hi,
Using (ASP Button or HyperLink)  onClick -> Add New Rows to an existing ASP table

I have create a table on button click (pls see code under code section).

Now, when ever user clicks on "Add More" , 4 Rows have to be appended to the existing table.

pls suggest me using javascript or ASP.net itself

ASP.net 2.0, C#.net

ASPX code
---------
<div>
    Rows: <asp:TextBox ID="txtRows" runat="server" Width="30px"> </asp:TextBox> <br />
    Cols: &nbsp;<asp:TextBox ID="txtCols" runat="server" Width="30px"></asp:TextBox>
     <asp:Button ID="btnGenerate" OnClick="btnGenerate_Click" runat="server" Text="Generate" />&nbsp;<br /> <br />
     <asp:Button ID="btnMoreRows" OnClick="btnMoreRows_Click" runat="server" Text="Add More" />&nbsp;<br /> <br />
	<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>  


ASPX.CS code
------------
ASP-Table Creation Function:
protected void btnGenerate_Click(object sender, EventArgs e)
{
    CreateDynamicTable();
}
 private void CreateDynamicTable()
{
    PlaceHolder1.Controls.Clear();
    // Fetch the number of Rows and Columns for the table 
    // using the properties
    int tblRows = 4;
    int tblCols = 4;
    // Create a Table and set its properties 
    //tb1 = new Table();
    // Add the table to the placeholder control
    PlaceHolder1.Controls.Add(tbl);
    // Now iterate through the table and add your controls 
    for (int i = 0; i < tblRows; i++)
    {
        TableRow tr = new TableRow();
        for (int j = 0; j < tblCols; j++)
        {
            TableCell tc = new TableCell();
            TextBox txtBox = new TextBox();
            txtBox.Text = "RowNo:" + i + " " + "ColumnNo:" + " " + j;
            // Add the control to the TableCell
            tc.Controls.Add(txtBox);
            // Add the TableCell to the TableRow
            tr.Cells.Add(tc);
        }
        // Add the TableRow to the Table
        tbl.Rows.Add(tr);
    }            
}

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