Basic Filtering with RadListView

3 posts, 0 answers
  1. Sergio
    Sergio avatar
    30 posts
    Member since:
    Jul 2010

    Posted 01 Apr 2011 Link to this post


    I am trying to create a basic filtering functionality similar to the found at the Demo documentation at

    The only distinction is that my application uses ObjectDataSource to bind  the RadListView control. Here is a brief about the ObjectDataSource

    <asp:ObjectDataSource ID="ObjectDataSource1" runat="server" TypeName="FriendBarDataSet"
        SelectMethod="GetFriends" OnSelecting="ObjectDataSource1_Selecting">
            <asp:Parameter Name="UserTable" />

      protected void ObjectDataSource1_Selecting(object sender, ObjectDataSourceSelectingEventArgs e)
            e.InputParameters["UserTable"] = UserTable;
    /// And in the FriendBarDataSet Class
    public SQLiteDataReader GetFriends(string UserTable)
            SQLiteConnection connection = new SQLiteConnection(WebConfigurationManager.ConnectionStrings["ConnectionString2"].ConnectionString);
            SQLiteCommand cmd = new SQLiteCommand();
            cmd.Connection = connection;
            StringBuilder SelectCommand = new StringBuilder();
            string Table = "[" + UserTable.ToString() + "]";
            string SQL = "SELECT [ID], [uid], [Name], [sex], [birthday_date] FROM ";
            string completeCommand = SQL + Table;
            cmd.CommandText = SelectCommand.ToString();
            return cmd.ExecuteReader(CommandBehavior.CloseConnection);

    The ListView Binds with No Problem. It is doing what it Suppose to do..

    However, when in try to implement a filter similar to the demo one, the filter is not functional and it throws me an error. Here is how i go about Implementing the filter..

    if (!String.IsNullOrEmpty(TextBoxFilter.Text))
                    RadListViewFriendSelection.FilterExpressions.BuildExpression().Contains("Name", TextBoxFilter.Text.Trim()).Build();

    The filer is throwing me the following exception::

    System.InvalidOperationException: DataReader has been closed @ RadListViewFriendSelection.Rebind()

    Could you help me implement a simple filter into this application? To filter - The "Name" field of the ListView control using "Contains". notice that I am accessing an SQLite data. I don't know if this happen to influence. In which case, I will be open to suggestions of implementing filtering in a different way.

    Thank you for your help.

  2. Maria Ilieva
    Maria Ilieva avatar
    4017 posts

    Posted 07 Apr 2011 Link to this post

    Hi Sergio,

    Note that when a Data Reader is used the data will be read only once and you could not manipulate them including filtering them and setting a filter expression. Therefore in this case I would suggest you to add the data form the data source in a DataTable and verify if this works for you.

    Maria Ilieva
    the Telerik team

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  4. Sergio
    Sergio avatar
    30 posts
    Member since:
    Jul 2010

    Posted 07 Apr 2011 Link to this post

    Thanks Maria

    The Filtering functionality of the RadListView I believe uses the Dataview.RowFilter property to filter the rows.

    As a result, simarly to ObjectDataSources, the data source needs to be represented by a DataSet, a DataTable, or a DataView Object.

    So instead of having my datasource return a SQLiteDataReader, I changed so it returned a DataTable and problem solve. Thought about including this for future references. :-)
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