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VB.NET : Dataset : Combo box's showing parent child relationship with XML datasource

Posted on 2004-03-26
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Last Modified: 2012-05-04
This should be fairly simple for many of you.

I have a configuration file (XML) that contains connection informatin.
I have no problem reading the data, or displaying it in a datagrid.

What I want to do is show server Names in one combo box. Then the corresponding list of user names in another combo box. This data is all in the xml file.

Example format of XML config file:
--------------------------------------------------------------------------------------------
<?xml version="1.0" standalone="yes"?>
<configuration>
  <ServerName Name="SomeName">
    <Login>
      <Username>user1</Username>
      <Password>password1</Password>
    </Login>
    <Login>
      <Username>user2</Username>
      <Password>password2</Password>
    </Login>
    <Login>
      <Username>user3</Username>
      <Password>password3</Password>
    </Login>
  </ServerName>
  <ServerName Name="AnotherServer">
    <Login>
      <Username>user1</Username>
      <Password>password1</Password>
    </Login>
    <Login>
      <Username>user2</Username>
      <Password>password2</Password>
    </Login>
    <Login>
      <Username>user3</Username>
      <Password>password3</Password>
    </Login>
  </ServerName>
</configuration>
--------------------------------------------------------------------------------------------

Here is what I've been doing to get the data.

--------------------------------------------------------------------------------------------

        Dim DS As DataSet
        Dim DV As DataView
        DS = New DataSet()
        DS.ReadXml(ConfigFile)
        DV = New DataView(DS.Tables("ServerName"))
        cmboServerName.DataSource = DV
        cmboServerName.DisplayMember = "Name"

--------------------------------------------------------------------------------------------

This works in populating cmboServerName with the list of available servers (from config file)

What I want to do next is tie a second combo box to the Usernames that are available for the selected server in cmboServerName.

What is the best way of doing this and how would I impliment it?

Thanks,
Tony
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Question by:mytonytiger
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Accepted Solution

by:
dfiala13 earned 500 total points
ID: 10689151
cmboServerName.ValueMember = "ServerName_Id"

DV1 = New DataView(DS.Tables("Login"))
DV1.RowFilter ="ServerName_Id = " cmboServerName.SelectedValue
cmboUserName.DataSource = DV1
cmboUserName.DisplayMember = "Username"

You'll want to call the code to update what's display in cmboUserName. whenver the selection in cmboServerName is changed.
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by:mytonytiger
ID: 10689326
Thank you very much.
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LVL 12

Expert Comment

by:dfiala13
ID: 10689370
You're welcome.
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