How do I retrieve a autonumber value from a ms-access database table

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I want to retrieve an auto number value from the ms-access database table from column name "id" using c# is asp.net
and then I want to convert that auto number value to "ToInt64" as a string value.
I have tried this but these queries are not working please do help me if you have any idea about that

C#

Int64 pid = Convert.ToInt64(Request.QueryString["id"]);

What I have tried:

please free to write any type of suggestion or Queries which I can try on my code

Posted 24-Aug-21 0:33am

Kaise karen?

Updated 24-Aug-21 2:01am

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Richard MacCutchan 24-Aug-21 6:52am

You first need to extract the value from the database with a SELECT statement.

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OriginalGriff · Answer 1 · 2021-08-24T02:01:00

And autonumber column is the same as any other column, except you can't write to it yourself.

So a normal SELECT will retrieve it. If you are trying to INSERT a new row and then get the number that was assigned, then

SQL

SELECT @@Identity

immediately after the INSERT will do it.
If you use ExecuteScalar instead of ExecuteReader or DataAdapter.Fill then you can just cast the result to an integer:

C#

int lastNo = (int) myCommand.ExecuteScalar();