[Question] :Add Delete Pin, through http-api, how?

[Xyncgas]

I tried posting something in my dotnet program :

class payload
{
    public string? content;
}
public class Program
{
    public static async Task Main(string[] args)
    {
        HttpClient httpClient = new HttpClient();
        var pl = new payload
        {
            content = "ABC"
        };
        var content = new StringContent(JsonSerializer.Serialize(pl, new JsonSerializerOptions
        {
            IncludeFields = true,
            DefaultIgnoreCondition = System.Text.Json.Serialization.JsonIgnoreCondition.WhenWritingNull
        }), Encoding.UTF8, "application/json");
        var res = await httpClient.PostAsync("http://localhost:5002/api/v0/add", content);
        Console.WriteLine(await res.Content.ReadAsStringAsync());
    }
}

I am trying to add a file, but I couldn't do it after reading many documentations including http://docs.ipfs.io.ipns.localhost:50002/reference/http/api/#getting-started

While this program logs

file argument 'path' is required

seems be saying you don't need path https://github.com/ipfs/js-ipfs/blob/master/docs/core-api/FILES.md

Can someone help me with simple examples how to add, delete, pin. I am not using an existing file, I just want to tell the API to create one in ipfs by providing the content of the file like "Hello World" And get back CID that I can go to https://ipfs.io/ipfs/{CID} and see "Hello World" And Use that CID to delete the file. And use that CID to Pin the file

[welcome[bot]]

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