ฟ้อง Error Conversion failed when converting the varchar value '<br>2' to data type int. แก้อย่างไรค่ะ asp.net c#

//update
              string StrConn2 = WebConfigurationManager.ConnectionStrings["connection"].ToString();
               SqlConnection Conn2 = new SqlConnection(StrConn2);
               System.Data.SqlClient.SqlCommand objCmd;
                Conn2.Open();
               string sqlProduct2;

               sqlProduct2 = "UPDATE snack SET" +
                    " Note = '" +  this.Label4.Text +"' " +
                        " WHERE  Id= '" + this.Label6.Text+ "'   ";
                SqlDataAdapter da2 = new SqlDataAdapter(sqlProduct2, Conn2);
                objCmd = new System.Data.SqlClient.SqlCommand();
                objCmd.Connection = Conn2; 
                objCmd.CommandType = CommandType.Text;
                objCmd.CommandText = sqlProduct2;
                objCmd.ExecuteNonQuery();