Saving config to JSON?

Question

JSON

In general, I created a program in which profiles are loaded into a combobox from a text document, its contents:

As a result, we have 2 lines in the combobox, well, it's logical.
Further below the combobox there are 2 fields, I enter the data there, and press the save button. The JSON config was saved easily, without any problems:

JsonSerializer jsonSerializer = new JsonSerializer();
            TextWriter writer = new StreamWriter("DataProfiles\\" + this.namez + ".json");
            jsonSerializer.Serialize(writer, this);
            writer.Close();

this.namez is the name of the profile, i.e. 11111 or 22222, there are two of them.
But after I close the program to open it again, the config is loaded (to fill in the fields with the data that I entered).
This error appears:

Code for loading the config:

FileStream fileStreamz = new FileStream("DataProfiles\\" + profiles3[0] + ".json", FileMode.Open);
                        string jsoncon = JsonConvert.SerializeObject(fileStreamz);
                        dtprof = (Dataprofiles)JsonConvert.DeserializeObject(jsoncon);
                        fileStreamz.Close();

What could be wrong?

Answer 1

Please show the json code.