Asp.net Controls

Hi
I have n number of content in div control. The div control have to display in the format of table. That is each row should have 3 columns. I have created html table in code behind file. While trying to add div control inside the div tag. It throws an exception. I tried the below code but it throws an exception. Kinldy tell me the solution for this problem
HtmlTable table = new HtmlTable();
HtmlRow row=new HtmlRow();
HtmlTableCell cell=new HtmlTableCell();
data.contols.Add(divcontrol);
row.Cells.Add(cell);
table.row.Add(row);
...