Check if user field is multiple or single user

                               Type fieldType = sliAction.Fields[fieldName].FieldValueType;
                                if (fieldType.Name.Equals("SPFieldUserValue"))
                                {
                                    if (sliAction[fieldName] != null)
                                    {
                                        SPFieldUserValueCollection userValues = new SPFieldUserValueCollection(web, sliAction[fieldName].ToString());
                                        string usr = "";
                                        foreach (SPFieldUserValue userV in userValues)
                                        {
                                            usr = usr + userV.LookupValue;
                                        }
                                        dr[fieldName] = usr;
                                    }
                                    if (sliAction["RespExt"] != null)
                                        dr[fieldName] = sliAction["RespExt"].ToString();                                                                           
                                }
                                else if(fieldType.Name.Equals("SPFieldUserValueCollection"))
                                {
                                    if (sliAction[fieldName] != null)
                                    {
                                        SPFieldUserValueCollection userValues = new SPFieldUserValueCollection(web, sliAction[fieldName].ToString());
                                        foreach(SPFieldUserValue spu in userValues)
                                            dr[fieldName] = dr[fieldName] + "," + spu.User.Name;
                                        dr[fieldName] = dr[fieldName].ToString().Substring(1, dr[fieldName].ToString().Length - 1);
                                    }
                                    if (sliAction["RespExt"] != null)
                                            dr[fieldName] = sliAction["RespExt"].ToString();                                                                             
                                }
                                else if (fieldType == typeof(DateTime))
                                { 
                                    if (sliAction[fieldName] != null)
                                    {
                                        string dateString = sliAction.Fields[fieldName].GetFieldValueForEdit(sliAction[fieldName]);
                                        dr[fieldName] = dateString;
                                    }
                                    else
                                    {
                                        dr[fieldName] = "-";
                                    } 
                                }

                                else
                                    dr[fieldName] = sliAction[fieldName];
                            }