I'm using Ext.net 1.2 == ExtJs 3.4.0

I wanna add the selected values (Filter with Name, Lname) to an ext's textbox.
I searched , and I could find the below codes, but now I don't know how I can add the the values from var values in JavaScript to an ext's textbox.

<script type="text/javascript">
    function AddUser() {
        var values = GridPanel1.getRowsValues(
            filterField: function (record, fieldName, value) {return fieldName == "Name" || fieldName == "Lname";}, 
            selectedOnly: true,
            currentPageOnly: false
        ////this method should be complete
<div style="width: 500px; margin: 0 auto;">
    <ext:Store ID="Store1" runat="server" OnRefreshData="Store1_RefreshData">
            <ext:JsonReader IDProperty="ID">
                    <ext:RecordField Name="ID" Type="Int" />
                    <ext:RecordField Name="RowNumber" Type="Int" />
                    <ext:RecordField Name="Name" />
                    <ext:RecordField Name="Lname" />
                    <ext:RecordField Name="EnterprisePosition" />
    <br />
    <ext:GridPanel ID="GridPanel1" runat="server" StoreID="Store1" StripeRows="true"
        Title="Result" Collapsible="true" StyleSpec="width:95%; margin:0 auto;"
        Height="350" Collapsed="true">
        <ColumnModel ID="ColumnModel1" runat="server">
                <ext:Column ColumnID="RowNumber" Header="Row" Width="50" Resizable="false" MenuDisabled="true"
                    Fixed="true" DataIndex="RowNumber" />
                <ext:Column ColumnID="Name" Header="Name" Width="100" DataIndex="Name" />
                <ext:Column Header="Last Name" Width="150" DataIndex="Lname" />
                <ext:Column Header="Position" Width="160" DataIndex="EnterprisePosition" />
            <ext:PagingToolbar ID="PagingToolBar1" runat="server" PageSize="10" StoreID="Store1"
                DisplayInfo="false" />
            <ext:CheckboxSelectionModel ID="CheckboxSelectionModel1" runat="server">
                    <RowSelect Fn="AddUser" /><!-- ******** -->
Could you please guide me ? Thanks