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How to Use a DataReader to Read in Data From a SQL database using VB.NET 2010

I was wondering if someone could explain to me how to use a datareader in VB.NET to read in data from a SQL database to the VB.NET code that is written. (Please use an example in the explanation so that I could see how the DataReader is being used.)
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thenthorn1010
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thenthorn1010
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Carl TawnSystems and Integration DeveloperCommented:
Are you trying to do something specific, or do you just need a basic example?

This article provides a sample of its usage if that's what you're after:

    http://www.developerfusion.com/article/4278/using-adonet-with-sql-server/2/
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silemoneCommented:
You will use a SQL Command and then you will executeDateReader.  Then the contents of what's returned will be stored in the dataReader.

The data reader is  a one-way, forward-only method of reading data.  That means if you have a control that takes item[1] and another control that takes item[3],  you have to make sure the control that takes item[2], even if its the last control on the page is loaded because once item[2] is passed by, you can't go back to it...unless you reiterate through the whole DataReader again.
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thenthorn1010Author Commented:
I am attempting to write out data that I have in a class by first populating the data using the DataReader to pass the values to values in a class. (Please see the attached classes that I have provided to see what data I am writing out.)

I am a bit new to the DataReader, as I am used to binding fields to the database and VB.NET as opposed to doing it with the DataReader. Let me know if you have any questions on the code. (The EDIAckHeader is the parent class to the EDIAckAddress class.)
EDIAckAddress.vb
EDIAckHeader.vb
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silemoneCommented:
Here's a basic example:

Dim conn As New SqlConnection(connectionString)
Dim comm As New SqlCommand("select * from mytable", conn)
comm.Connection.Open()
Dim r As SqlDataReader = comm.ExecuteReader(CommandBehavior.CloseConnection)
While r.Read()
      Console.WriteLine(r.GetString(0))
End While
r.Close()
conn.Close()
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silemoneCommented:

Dim conn As New SqlConnection(connectionString)
Dim comm As New SqlCommand("select * from mytable", conn)
comm.Connection.Open()
Dim r As SqlDataReader = comm.ExecuteReader(CommandBehavior.CloseConnection)
While r.Read()
            strRecordType = r["fieldname"]
            strCustomerNumber = r["fieldname"]
            strChangeFlag = r["fieldname"]
            strOrderNumber = r["fieldname"]
           strOrderDate = r["fieldname"]
            strShipVia = r["fieldname"]
            strCustomerPONumber = r["fieldname"]
            strCustomerPOReleaseNumber = r["fieldname"]
            strPODate = r["fieldname"]
            strSystemDate = r["fieldname"]
            strSystemTime = r["fieldname"]
            strGSSenderID = r["fieldname"]
            strTD5DNSNumber = r["fieldname"]
            strTradingPartnerName = r["fieldname"]
            strDocument_TransactionID = r["fieldname"]
            strReceiverID = r["fieldname"]
            strSenderID = r["fieldname"]

           ''Where fieldname is the columname from db

End While
r.Close()
conn.Close()

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thenthorn1010Author Commented:
Thanks for the help. This really showed me how the data would be written and will help me output the data effectively to the correct code to utilize these classes.
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silemoneCommented:
Happy to share

Cheers
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