how to set Checkbox in HTML table grid?

Hi..

I am using HTML table grid .

I want to set check box in first column of grid.

i am using the append method to fetch the data from database

here is my code..

public void load_builder()
{
    SqlConnection con = new SqlConnection(constring);
    con.Open();
    string sql = "select category_code,category,created_date from category";
    SqlCommand cmd = new SqlCommand(sql, con);
    SqlDataReader dr;
    dr = cmd.ExecuteReader();
    //sb.Append("");
    while (dr.Read())
    {

        sb.Append("");
        sb.Append("select");
        sb.Append("" + dr[0].ToString() + "");
        sb.Append("" + dr[1].ToString() + "");
        sb.Append("" + dr[2].ToString() + "");
        sb.Append("");
    }
}

Instead of select i want to set checkbox.

pls help me..

Advanx thx..

Sudharsan S.