ext.net store Clear Filter problems in combobox

Question

Case 1 (working fine)

1. Open the page
2. Select a value from the combobox1
3. Select other value from the combobox2
4. Click New record

Case 2 (issue)

1. Open the page, write some word for filter the combobox1 for example "H"
2. Select other value from the combobox2 filter word "B"
3. Click New record
4. combobox1 - just showing which values starting "H"
5. combobox2 - just showing which values starting "B" Code;

aspx

<ext:ComboBox ID="combobox1 " runat="server" DisplayField="CountyName" ValueField="ISSCode" QueryMode="Local">
<Store> <ext:Store ID="str1" runat="server" AutoDataBind="true">

aspx.cs

Before databind I used clearfilter()

str1.ClearFilter();
str1.DataSource = countyDataTable;
str1.DataBind();

Answer 1

Try this solution

combobox1.Reset();
strCounties.DataSource = countyDataTable;
strCounties.DataBind();