Cant Get Selected Rows Using Extra parameter

[antoreegan]

        <Items>
            <ext:GridPanel ID="GridPanelConfirmNeft" runat="server" Border="true" Height="200"
                Title="Confirmed Neft Payout Request" MarginSpec="0 5 5 5" ColumnWidth="0.6"
                EnableColumnMove="false" TabMenuHidden="true">
                <Store>
                    <ext:Store ID="StoreConfirmNeft" runat="server" PageSize="20">
                        <Model>
                            <ext:Model ID="Model4" runat="server" IDProperty="ID">
                                <Fields>
                                    <ext:ModelField Name="VendorName" />
                                    <ext:ModelField Name="BridgeCode" />
                                    <ext:ModelField Name="AmountPayable" />
                                    <ext:ModelField Name="PayoutRequestDate" />
                                    <ext:ModelField Name="VendorPayoutsID" />
                                </Fields>
                            </ext:Model>
                        </Model>
                    </ext:Store>
                </Store>
                <ColumnModel ID="ColumnModel4" runat="server">
                    <Columns>
                        <ext:Column ID="Column1vendorName" runat="server" Text="vendorName" Sortable="true"
                            DataIndex="VendorName" Flex="1">
                        </ext:Column>
                        <ext:Column ID="Column2BridgeCode" runat="server" Text="BridgeCode" Sortable="true"
                            DataIndex="BridgeCode" Flex="1">
                        </ext:Column>
                        <ext:Column ID="Column3" runat="server" Text="AmountPayable" Sortable="true" DataIndex="AmountPayable"
                            Flex="1">
                        </ext:Column>
                        <ext:Column ID="ColumnIFSCCode" runat="server" Text="PayoutRequestDate" Sortable="true"
                            DataIndex="PayoutRequestDate" Flex="1">
                        </ext:Column>
                    </Columns>
                </ColumnModel>
                <SelectionModel>
                    <ext:CheckboxSelectionModel ID="CheckboxSelectionModel2" runat="server" />
                </SelectionModel>
                <View>
                    <ext:GridView ID="GridView4" runat="server" LoadMask="false" />
                </View>
                <Features>
                    <ext:GridFilters ID="GridFilters4" runat="server" Local="true">
                        <Filters>
                            <ext:StringFilter DataIndex="VendorNameAsInMaster" />
                            <ext:StringFilter DataIndex="BridgeCode" />
                            <ext:StringFilter DataIndex="Status" />
                        </Filters>
                    </ext:GridFilters>
                </Features>
                <BottomBar>
                    <ext:PagingToolbar ID="PagingToolbar4" HideRefresh="true" runat="server" DisplayInfo="true"
                        DisplayMsg="Displaying Jobs {0} - {1} of {2}">
                    </ext:PagingToolbar>
                </BottomBar>
            </ext:GridPanel>
        </Items>
        <Items>
            <ext:Button ID="Button4" runat="server" Text="Submit with values">
                <DirectEvents>
                    <Click OnEvent="ConfirmNEFT_Click">
                        <ExtraParams>
                            <ext:Parameter Name="Values" Value="Ext.encode(#{GridPanelConfirmNeft}.getRowsValues({selectedOnly:true}))"
                                Mode="Raw" />
                        </ExtraParams>
                    </Click>
                </DirectEvents>
            </ext:Button>
        </Items>

this is my Code behind

 protected void ConfirmNEFT_Click(object sender, DirectEventArgs e)
    {

        string grid1Json = e.ExtraParams["Values"];

        //XML representation
        XmlNode grid1Xml = JSON.DeserializeXmlNode("{records:{record:" + grid1Json + "}}");

        //array of Dictionaries
        Dictionary<string, string>[] grid2Data = JSON.Deserialize<Dictionary<string, string>[]>(grid1Json);
    }

Plz Help me Dudes...

[antoreegan]

Its Solved..