asp.net avoid duplicates in string builder

hello everbody, i have a some problem on my code, i want get data from mssql, after get data put my table inside but i have a some problem,same data getting two times<br> StringBuilder sb = new StringBuilder(); foreach (Coffee coffee in coffeeList) { sb.Append(string.Format(@"<table> <tr> <td rowspan='6'><img runat='server' src='{6}' /></td> <td>Name :</span></td> <td>{0}</td> <td rowspan='6'><img runat='server' src='{6}' /></td> <td>Name :</span></td> <td>{0}</td> </tr> <tr> <td>Type:</td> <td>{1}</td> <td>Type:</td> <td>{1}</td> </tr> <tr> <td>Price:</td> <td>{2}</td> <td>Price:</td> <td>{2}</td> < ...