Data Readers

Hello All!

I'm a VB .NET programmer but I'm also doing some C# code as well. Could someone show me some code examples of how Data Readers are looped?

Here's how I do this in VB .NET:

con.Open 'Open connection

dr = com.ExecuteReader 'Use Command to Execute Reader

Do While dr.Read

ComboBox.Items.Add(dr!CustomerID) 'Read field Customer ID Key

End Loop
con.Close
con = Nothing 'Release object

Here's some of the understanding of C# sharp so far:

con.Open;

dr = com.ExecuteReader;

do while dr.Read :confused:

// Method here? :confused:

con.Close :confused:

con.Open;

dr = com.ExecuteReader();

While(dr.Read()) {
comboBox.Items.Add(dr!CustomerID);
}

con.Close();
(not sure about this one though): con = null;

This:

vb Code:

con = Nothing 'Release object

does not do what you think it does. You should be doing this:

vb Code:

con.Dispose()

Also, I'm not 100% sure that C# supports this notation:

vb Code:

dr!CustomerID

If it does then cool, but if it doesn't then use this:

vb Code:

dr("CustomerID")

Shouldn't that be dr["CustomerID"]?

Quote:

---

Originally Posted by penagate

Shouldn't that be dr["CustomerID"]?

---

Indeed. :blush:

Thanks guys. I will give some of these a go.

PS Never like database programming the best of times. :wave:

I used to hate database programming but really it's mostly because libraries insist on making it more complicated than necessary. .NET provides a large array of classes to ease data access but it can be hard to decide which ones you need (in other words, it almost provides too many). Once you get the hang of creating a basic data access layer you realise it's very simple and you can follow the same patterns in many of your applications.

Allot advice down under. Cheers!

PS I'm from England by the way. :thumb:

Are you aware that you created and replied to this thread using two different user names?

Indeed, had some internet problems along with email problems as well. :cry: