NEWBIE NEEDS HELP - pull value from sql table

I have searched this forum and can't find the answer to my question. I have a login page that validates username/password. I am validating that the username is in the sql table, but I would also like to return the rest of the information for that user to pass in a querystring. For example, the user ID . I have setup my sql string to select username, password, Name, and email. How do I pull the id from this dataset?

userDataset = myUserVAlidation(enterUsername, enterPassword)
If userDataset.tables(0).rows.count = 1 then
 'found record in database table
ENd if
Function myUserValidation(ByVal username as string, byVal password as string)
Dim connectionString as ...
Dim sqlConn as system.data.sqlclient.sqlconnection = new system.data.sqlClient.sqlconnection(connectionSTring)
Dim sqlString as string = "Select [userTable][username], [userTable][password], [userTable][fullName], [userTable][id] where (([userTable].[username] = @dotnet.itags.org.username) and ([userTable].[password] = @dotnet.itags.org.password))"
Dim sqlCommand as system.data.sqlclient.sqlcommand = new system.data.sqlclient.sqlCommand(sqlString, sqlConn)
sqlCommand.parameters.add("@dotnet.itags.org.username", system.data.sqldbtype.varchar).value = username
sqlCommand.parameters.add("@dotnet.itags.org.password", system.data.sqldbtype.varchar).value = password
dim dataAdapter as system.data.sqlclient.sqldataadapter = new system.data.sqlclient.sqldataadapter(sqlCommand)
dim dataset as system.data.dataset = new system.data.dataset
dataadapter.fill(dataset)
return dataset
end function

To get the id you could use the following:

string id = userDataset.Tables[0].Rows[0].ItemArray.GetValue(3)

The index for GetValue = 3 because id is the 4th column returned from your sql statement.