Groupwise Item in Asp.Net Gridview

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Gridview

Hi,

The following source i have used to show the data with group header. It is showing fine. But when i click on View link then grouped row rebind automatically. I tried to debug this binding in databound event. I couldnt catch it. What is the problem in my code to show the data in group wise.

<asp:GridView ID="gvData" runat="server" Width="100%" AutoGenerateColumns="false"
    EmptyDataText="No record found" AllowSorting="false" AlternatingRowStyle-CssClass="alt"
    CssClass="myGrid" OnRowDataBound="gvData_RowDataBound" OnRowCommand="gvData_RowCommand">
    <Columns>
        <asp:BoundField HeaderText="Id" ItemStyle-HorizontalAlign="Left" DataField="RewardId"
            Visible="false" />
        <asp:BoundField HeaderText="Name" ItemStyle-HorizontalAlign="Left" DataField="AccountName" />
        <asp:BoundField HeaderText="Email" ItemStyle-HorizontalAlign="Left" DataField="Email" />
        <asp:BoundField HeaderText="Status" ItemStyle-HorizontalAlign="Left" DataField="StatusName" />
        <asp:BoundField HeaderText="Cash Back" ItemStyle-HorizontalAlign="Right" DataField="CashBack" />
        <asp:BoundField HeaderText="ATM Refund" ItemStyle-HorizontalAlign="Left" DataField="ATMRefund" />
        <asp:BoundField HeaderText="Send On" ItemStyle-HorizontalAlign="Left" DataField="SendOn" />
        <asp:TemplateField>
            <ItemTemplate>
                <asp:LinkButton runat="server" ID="lnkView" CommandName="View" CommandArgument='<%# Eval("RewardId") %>'
                    Text="View"></asp:LinkButton>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField HeaderText="Status" ItemStyle-HorizontalAlign="Left" DataField="Status"
            Visible="false" />
    </Columns>
</asp:GridView>

protected void gvData_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        int rewardId = Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "RewardId").ToString());
        if (rewardId < 0)
        {
            e.Row.Cells.Clear();
            TableCell cell = new TableCell();
            cell.Text = "Account Name : " + DataBinder.Eval(e.Row.DataItem, "AccountName").ToString();
            cell.ColumnSpan = 7;
            cell.CssClass = "GroupHeaderStyle";
            e.Row.Cells.Add(cell);
        }
    }
}

protected void gvData_RowCommand(object sender, GridViewCommandEventArgs e)
{
    if (e.CommandArgument != null)
    {
        try
        {
            var strDataId = e.CommandArgument;
            if (strDataId != null && e.CommandName == "View")
            {
                int intID = Convert.ToInt32(strDataId);
                if (intID > 0)
                {
                    FillData(intID);
                }
            }

        }
        catch (Exception ex)
        {

        }
    }
}