How to get data with table formate in pdf

Question

my code is

StringBuilder sb = new StringBuilder();    
        sb.Append("<table border="1">"); 
            sb.Append("<tr>");         
          
 sb.Append("</tr>"); 
            foreach (DataGridViewRow row in dgv.Rows)   
          {               
  foreach (DataGridViewCell cell in row.Cells) 
                {            
         sb.AppendFormat("<tr>");   
                  sb.AppendFormat("<td>"); 
                        sb.Append(cell.Value); 
                    sb.AppendFormat("</td>");     
                sb.AppendFormat("</tr>");        
         }                              }             sb.Append("</table>");             return sb.ToString();