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Wrong Control is Filtered with Multiple Instances are Present on the Page

When the RadFilter and the control it filters are on a user control and you have more than one instance of the same user control on the page, the wrong control may be filtered.

This can happen if the filter is in a different INamingContainer from the grid it filters.

What happens in such a case is the following:

  1. RadFilter looks for its target in the current NamingContainer.
  2. The target is not found, so the entire page control hierarchy must be traversed.
  3. RadFilter invokes a recursive FindControl() from the Page or MasterPage.
  4. The first instance of the user control on the page meets the criteria and all filters from all instances work with the first instance.

To fix this use the UniqueID of the target:

protected void Page_Load(object sender, EventArgs e)
    if (!Page.IsPostBack)
        RadFilter1.FilterContainerID = RadGrid1.UniqueID;
Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
    If Not Page.IsPostBack Then
        RadFilter1.FilterContainerID = RadGrid1.UniqueID
    End If
End Sub

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