create dynamic Imagebutton through string builder or placeholder in for loop

StringBuilder sb = new StringBuilder();
       dtSkills = (DataTable)Session["dtSkills"];
       if (dtSkills != null)
       {
           if (dtSkills.Rows.Count > 0)
           {
               for (int i = 0; i < dtSkills.Rows.Count; i++)
                {
                    sb.Append("<span style="border:1px solid #DEDEC8;background:#F8F8EF;padding:6px;border-radius: 7px;margin: 5px;float:left;">");
                    sb.Append("" + dtSkills.Rows[i]["Skills"].ToString() + "");
                    sb.Append("<a href=""><Image src='../images/GVDelete.png' alt='Delete'/></a>");
                    sb.Append("</span>");

                }
                divITSkillsList.InnerHtml = sb.ToString();
            }
        }


protected void btnDeleteITSkills_Click(object sender, EventArgs e)
    {
        Image lnkdelete = (Image)sender;
        RepeaterItem item = lnkdelete.NamingContainer as RepeaterItem;
        int RepeaterItemIndex = item.ItemIndex;
        DataTable dt = Session["dtSkills"] as DataTable;
        dt.Rows[RepeaterItemIndex].Delete();
        Session["dtSkills"] = dt;
        ShowdivITSkillsList();
    }