On a update (There is already a parameter with the name '@xxxxxxx' in this collection.)

[Paul Enright]

I am using VB.NET, Visual Studio 2022, Win 10

While trying to integrate MySQL into a framework that I did not create, I am getting the subject error. Let me try and create some context.
This framework started out as a wrapper for AccessDB, then SQL Server was added. Next came SQLite, CSV, XLS, AS400, etc.
There are a series of case statements that build a connect string for the connection. Then the needed 'DbProviderFactories' is created. Then a 'DataTable'(dt) is built 'DbCommand'(cmd)->'ExecuteReader'(reader as cmd.ExecteReader)->dt.Load(reader).

All this works and there the table is loaded. I can access the rows and fields. I can update a Row/Field. If I display the Row/Field I can see the change. But when I try and update the table, I get the subject error where @xxxxx is the name of the field I was trying to change.

The update is something like ...
_da as Common.DbDataAdapter from what was created via DbProviderFactories.
_da.Update(dt)

I can give more detail, but did not want to make the post any more confusing than I already did. :-)
Just let me know what might help make it more clear.