Hi, I need to be able to change a record in Umbraco Forms. 

A few obstacles, the current ones has to do with the fact that the current form might differ a bit from the form at the time of the saved record. 

Here is what I have currently:

public static void UpdateEntry(string formGuid, int entryId, Dictionary<string, string> entry)
{
    var recordStorage = new RecordStorage();
    var formStorage = new FormStorage();
    var form = formStorage.GetForm(new Guid(formGuid));
    var record = recordStorage.GetRecord(entryId, form);
    var isChanged = false;


            foreach (var property in entry) // entry is a dictionary<string,string>
            {

                var fieldName = property.key; // using form captions for keys in the dictionary
                if (form.AllFields.Any(f => f.Caption == fieldName)) // loop all current fields in form
                {

                    if (record.RecordFields.Any(f => f.Value.Field!=null && f.Value.Field.Caption == fieldName)) // does it exist in the record?
                    {
                        var field = record.RecordFields.SingleOrDefault(f => f.Value.Field != null && f.Value.Field.Caption == fieldName).Value;

                        var value = field.ValuesAsString();
                        if (value != property.Value) // has it changed?
                        {
                            field.Values.Clear();
                            field.Values.Add(property.Value);
                            isChanged = true;
                        }
                    }
                    else // we need to add it to the record
                    {
                        var formField = form.AllFields.SingleOrDefault(f => f.Caption == fieldName);
                        var newField = Guid.NewGuid();
                        var recordField = new RecordField
                        {
                            Field = formField,
                            Key = newField,
                            Record = record.Id,
                            Values = new List<object> { property.Value }
                        };

                        using (var recordFieldStorage = new RecordFieldStorage())
                            recordFieldStorage.InsertRecordField(recordField);

                        record.RecordFields.Add(newField, recordField);
                        isChanged = true;
                    }
                }

            }
        }
        if (isChanged)
        {
            foreach (var field in record.RecordFields) // fix null value fields
            {
                if (field.Value == null || field.Value.Values == null)
                {
                    field.Value.Values.Clear();
                    field.Value.Values.Add("");
                }
            }


            try
            {
                recordStorage.UpdateRecord(record, form);
            }
            catch (Exception)
            {

                // this currently causes null execption, I think because null value in some field

            }

            //recordStorage.UpdateRecordXml(record, form);  // do we need this?

        }
        formStorage.Dispose();
        recordStorage.Dispose();
    }
}