How can I insert label text in tablecell on button click

<pre>function CreateTable(){
    var rowCtr;
    var cellCtr;
    var rowCnt;
    var cellCnt;

    var myTableDiv = document.getElementById('myDynamicTable');

    var table = document.createElement('table');
    table.setAttribute("contenteditable", "true");
    table.border = "1";
    table.id = "myTable";


    var tableBody = document.createElement('tbody');
    table.appendChild(tableBody);

    rowCnt = document.getElementById('txtrows').value;
    cellCnt = document.getElementById('txtcols').value;

    for (rowCtr = 0; rowCtr < rowCnt; rowCtr++) {

        var tr = document.createElement('tr');
        tableBody.appendChild(tr);

        for (cellCtr = 0; cellCtr < cellCnt; cellCtr++) {

            var td = document.createElement('td');
            td.width = '120';
            td.appendChild(document.createTextNode("Row:" + rowCtr + " Column:" + cellCtr));
            tr.appendChild(td);
        }
    }
    myTableDiv.appendChild(table);
  }

<asp:Button ID="button1" Text="button" runat="server" OnClick="demo" />

public void demo()
{
    TableCell tcell = new TableCell();
    RadLabel rlbl = new RadLabel();
    rlbl.Text = "test";
    tcell.Controls.Add(rlbl);

}

protected void demo(object sender, EventArgs e)
{
    demo();
}