Reset Multiple Radcomboboxes as filters in RadGrid

[illumination]

I need to know how to reset radcombobox as filter in the radgrid.

                <telerik:GridBoundColumn DataField="Dept" HeaderText="Department" SortExpression="Dept"
                    UniqueName="Dept" >
                    <FilterTemplate>
                    <asp:TextBox runat="server" ID="TextBox1" style="display:none;">
                    </asp:TextBox>
                    <telerik:RadComboBox ID="cboRadDept" DataSourceID="DeptSqlDS" DataTextField="Name" DataValueField="Name"
                        AutoPostBack="True" AppendDataBoundItems="True" Height="100%" Width="170px"
                        SelectedValue='<%# TryCast(Container, GridItem).OwnerTableView.GetColumn("Dept").CurrentFilterValue %>'
                        runat="server" OnSelectedIndexChanged="cboRadDept_SelectedIndexChanged" Skin="WebBlue" >
                        <Items>
                        <telerik:RadComboBoxItem />
                        </Items>
                    </telerik:RadComboBox>
                    </FilterTemplate>
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="From" HeaderText="Originator" SortExpression="From"
                    UniqueName="From">
                    <FilterTemplate>
                    <asp:TextBox runat="server" ID="TextBox2" style="display:none;">
                    </asp:TextBox>
                    <telerik:RadComboBox ID="cboRadFrom" DataSourceID="FromSqlDS" DataTextField="UserName" DataValueField="UserName"
                        AutoPostBack="True" AppendDataBoundItems="True"
                        SelectedValue='<%# TryCast(Container, GridItem).OwnerTableView.GetColumn("From").CurrentFilterValue %>'
                        runat="server" OnSelectedIndexChanged="cboRadFrom_SelectedIndexChanged" Skin="WebBlue">
                        <Items>
                        <telerik:RadComboBoxItem />
                        </Items>
                    </telerik:RadComboBox>
                    </FilterTemplate>
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="Status" HeaderText="Status" SortExpression="Status" UniqueName="Status">
                    <FilterTemplate>
                    <asp:TextBox runat="server" ID="TextBox3" style="display:none;">
                    </asp:TextBox>
                    <telerik:RadComboBox ID="cboRadStatus" DataSourceID="StatusSqlDS" DataTextField="Status" DataValueField="Status"
                        AutoPostBack="True" AppendDataBoundItems="True" Height="100%" Width="85px"
                        SelectedValue='<%# TryCast(Container, GridItem).OwnerTableView.GetColumn("Status").CurrentFilterValue %>'
                        runat="server" OnSelectedIndexChanged="cboRadStatus_SelectedIndexChanged" Skin="WebBlue">
                        <Items>
                        <telerik:RadComboBoxItem />
                        </Items>
                    </telerik:RadComboBox>
                    </FilterTemplate>
                </telerik:GridBoundColumn>

    Protected Sub cboRadDept_SelectedIndexChanged(ByVal o As Object, ByVal e As RadComboBoxSelectedIndexChangedEventArgs)
        Dim filterItem As GridFilteringItem = DirectCast(RadGrid1.MasterTableView.GetItems(GridItemType.FilteringItem)(0), GridFilteringItem)
        TryCast(filterItem("Dept").Controls(1), TextBox).Text = e.Value
        filterItem.FireCommandEvent("Filter", New Pair("EqualTo", "Dept"))
    End Sub

    Protected Sub cboRadFrom_SelectedIndexChanged(ByVal o As Object, ByVal e As RadComboBoxSelectedIndexChangedEventArgs)
        Dim filterItem As GridFilteringItem = DirectCast(RadGrid1.MasterTableView.GetItems(GridItemType.FilteringItem)(0), GridFilteringItem)
        TryCast(filterItem("From").Controls(1), TextBox).Text = e.Value
        filterItem.FireCommandEvent("Filter", New Pair("EqualTo", "From"))
    End Sub

    Protected Sub cboRadStatus_SelectedIndexChanged(ByVal o As Object, ByVal e As RadComboBoxSelectedIndexChangedEventArgs)
        Dim filterItem As GridFilteringItem = DirectCast(RadGrid1.MasterTableView.GetItems(GridItemType.FilteringItem)(0), GridFilteringItem)
        TryCast(filterItem("Status").Controls(1), TextBox).Text = e.Value
        filterItem.FireCommandEvent("Filter", New Pair("Contains", "Status"))
    End Sub

I am able to use 3 radcomboboxes as filters in the grid. the problem is that when I finished filtering and I have AppendDataBoundItems="True" and using <Items><telerik:RadComboboxItem></Items>, that it will automatically give me 1 empty row. if I click this empty row, it won't go back to selectedvalue. it's like nothing or selectedindex = -1 and then rebind the grid with the rest of the filters. Or is there another way?
Please help.
Thank you.

[Sebastian]

Hi illumination,

To see how this can be done, review the implementation from the following online demo of RadGrid for ASP.NET AJAX (Q1 2009 Beta):

http://demos.telerik.com/aspnet-ajax-beta/grid/examples/programming/filtertemplate/defaultcs.aspx

The idea is to invoke the filter method from the client-side API of the grid with the value from the filter control/ filter function passed as an argument. Feel free to modify/extend the approach to conform to your project schema.

Kind regards,
Sebastian
the Telerik team

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[illumination]

Sebastian,
Thank you for the reply.
I have figured it out. I am currently using the 1314 version of Q3 so I am not using beta yet.
This is my solution:
add cboRadDept_Prerender on cboRadDept, cboRadFrom_Prerender on cboRadFrom, cboRadStatus_Prerender on cboRadStatus.

    Protected Sub cboRadDept_SelectedIndexChanged(ByVal o As Object, ByVal e As RadComboBoxSelectedIndexChangedEventArgs)
        Dim filterItem As GridFilteringItem = DirectCast(RadGrid1.MasterTableView.GetItems(GridItemType.FilteringItem)(0), GridFilteringItem)
        If (e.Value.ToString()) = "" Then
            ViewState("cboRadDeptValue") = e.Value
            TryCast(filterItem("Dept").Controls(1), TextBox).Text = e.Value
            filterItem.FireCommandEvent("Filter", New Pair("NoFilter", "Dept"))
        Else
            ViewState("cboRadDeptValue") = e.Value
            TryCast(filterItem("Dept").Controls(1), TextBox).Text = e.Value
            filterItem.FireCommandEvent("Filter", New Pair("EqualTo", "Dept"))
        End If
    End Sub

    Protected Sub cboRadFrom_SelectedIndexChanged(ByVal o As Object, ByVal e As RadComboBoxSelectedIndexChangedEventArgs)
        Dim filterItem As GridFilteringItem = DirectCast(RadGrid1.MasterTableView.GetItems(GridItemType.FilteringItem)(0), GridFilteringItem)
        If (e.Value.ToString()) = "" Then
            ViewState("cboRadFromValue") = e.Value
            TryCast(filterItem("From").Controls(1), TextBox).Text = e.Value
            filterItem.FireCommandEvent("Filter", New Pair("NoFilter", "From"))
        Else
            ViewState("cboRadFromValue") = e.Value
            TryCast(filterItem("From").Controls(1), TextBox).Text = e.Value
            filterItem.FireCommandEvent("Filter", New Pair("EqualTo", "From"))
        End If
    End Sub

    Protected Sub cboRadStatus_SelectedIndexChanged(ByVal o As Object, ByVal e As RadComboBoxSelectedIndexChangedEventArgs)
        Dim filterItem As GridFilteringItem = DirectCast(RadGrid1.MasterTableView.GetItems(GridItemType.FilteringItem)(0), GridFilteringItem)
        If (e.Value.ToString()) = "" Then
            ViewState("cboRadStatusValue") = e.Value
            TryCast(filterItem("Status").Controls(1), TextBox).Text = e.Value
            filterItem.FireCommandEvent("Filter", New Pair("NoFilter", "Status"))
        Else
            ViewState("cboRadStatusValue") = e.Value
            TryCast(filterItem("Status").Controls(1), TextBox).Text = e.Value
            filterItem.FireCommandEvent("Filter", New Pair("Contains", "Status"))
        End If
    End Sub

    Protected Sub cboRadDept_PreRender(ByVal sender As Object, ByVal e As EventArgs)
        If ViewState("cboRadDeptValue") <> Nothing Then
            TryCast(sender, RadComboBox).SelectedValue = ViewState("cboRadDeptValue").ToString()
        ElseIf ViewState("cboRadDeptValue") = "" Then
            TryCast(sender, RadComboBox).SelectedValue = ""
        End If
    End Sub

    Protected Sub cboRadFrom_PreRender(ByVal sender As Object, ByVal e As EventArgs)
        If ViewState("cboRadFromValue") <> Nothing Then
            TryCast(sender, RadComboBox).SelectedValue = ViewState("cboRadOriginatorValue").ToString()
        ElseIf ViewState("cboRadFromValue") = "" Then
            TryCast(sender, RadComboBox).SelectedValue = ""
        End If
    End Sub

    Protected Sub cboRadStatus_PreRender(ByVal sender As Object, ByVal e As EventArgs)
        If ViewState("cboRadStatusValue") <> Nothing Then
            TryCast(sender, RadComboBox).SelectedValue = ViewState("cboRadStatusValue").ToString()
        ElseIf ViewState("cboRadStatusValue") = "" Then
            TryCast(sender, RadComboBox).SelectedValue = ""
        End If
    End Sub

Thanks for link though, I will need it when I move to the new Q1 2009.