Casting ##IDENTITY to Long (Int32) in an Access SQL query - sql

Question

I want to use this syntax but I cant:
Select (Clng ( ##IDENTITY ) )
Or
Clng ( select ( ##IDENTITY ) )
I want to get last inserted id in current scope and cast it to the Long type..how can I make this in one query?
..
This query worked correctly:
Select ##identity
And give me the last inserted autonumber in current session but I want to cast it to the something else in one query

Answer 1

In the first query , You are converting a value into long while you are retrieving it, which is a valid operation.
When you use second query , when select statement is used, you are getting a record set and not an single value.
You can not apply clng on result set but you can apply on a single value
Updated Code:
Check the sample code below:
string query = "Insert Into Categories (CategoryName) Values (?)";
string query2 = "Select ##Identity";
long ID;
string connect = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|Northwind.mdb";
using (OleDbConnection conn = new OleDbConnection(connect))
{
using (OleDbCommand cmd = new OleDbCommand(query, conn))
{
cmd.Parameters.AddWithValue("", Category.Text);
conn.Open();
cmd.ExecuteNonQuery();
cmd.CommandText = query2;
ID = (long)cmd.ExecuteScalar();
}
}
I just gave the C# version of code as i was not much aware of VB or VB.Net . More over , methodology is the same