SPGridView PageIndexChanging does not hit when debugging

Question

I have a SP grid view which has loads data in a IList (data added to iList from DB). When the pager pagination arrows "< >" are clicked the pager sometimes loads the same set. When I tried to debug the "myGridView_PageIndexChanging" doesn't get hit. Any reason why? And what would be a better approach for this?

Code I have is:

1) SPDataGrid:

<SharePoint:SPGridView ID="myGridView" runat="server" AutoGenerateColumns="false" AllowSorting="false" OnRowDataBound="myGridView_RowDataBound" >

pager:

<SharePoint:SPGridViewPager ID="myGridViewPager" runat="server" GridViewId="myGridView" Visible="false">

2) On page load I have set code as:

myIList = MethdToGenerateMyIList();

myGridView.AllowPaging = true;
myGridView.PageSize = 10;
myGridView.PageIndexChanging += myGridView_PageIndexChanging;

memberGridView.DataSource = myIList;
memberGridView.DataBind();

3) The page index changing method is:

private void myGridView_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        try
        {
            myGridView.PageIndex = e.NewPageIndex;
            myGridView.DataSource = myIList;
            myGridView.DataBind();
        }
        catch (Exception ex)
        {
        }
    }

Answer 1

method 1)

asp.net

<asp:SPGridView ID="myGridView" runat="server" AllowPaging="True" GridLines="None" 
        OnPageIndexChanging="myGridView_PageIndexChanging" PageSize="10" ShowHeader="False" ShowFooter="False" /> 

c#

onload

myIList = MethdToGenerateMyIList();
memberGridView.DataSource = myIList;
memberGridView.DataBind();

gridview event

private void myGridView_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
    try
    {
        myGridView.PageIndex = e.NewPageIndex;
        myGridView.DataSource = myIList;
        myGridView.DataBind();
    }
    catch (Exception ex)
    {
    }
}

Method 2)

instead of asp.net, as you tried todo in .cs codebehind:

asp.net

<SharePoint:SPGridView ID="myGridView" runat="server" AutoGenerateColumns="false" AllowSorting="false" OnRowDataBound="myGridView_RowDataBound" >

.cs onload:

myIList = MethdToGenerateMyIList();

myGridView.AllowPaging = true;
myGridView.PageSize = 10;
myGridView.PageIndexChanging += new EventHandler(myGridView_PageIndexChanging);

memberGridView.DataSource = myIList;
memberGridView.DataBind();

grid view event

private void myGridView_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
    try
    {
        myGridView.PageIndex = e.NewPageIndex;
        myGridView.DataSource = myIList;
        myGridView.DataBind();
    }
    catch (Exception ex)
    {
    }
}