Setting Css value from code behind

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Hi

I have a page where i am creating table row and table cell dynamically and adding a control to in it.

It is as below

HtmlTableRow tr = new HtmlTableRow();
HtmlTableCell td = new HtmlTableCell();


tr.ID = "tr" + i.ToString();
tblPerSetngs.Controls.Add(tr);
CheckBox chk = new CheckBox();
chk.ID = "chk" + i.ToString();
chk.Text = dtTechSkills.Rows[i]["SkillName"].ToString();


td.Controls.Add(chk);
tr.Controls.Add(td);
table.Controls.Add(tr);

the control is adding wel and fine. but now i want to set the css style to the table row.

Thanks in advance
Naina