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Get Outer Repeater Item from Inner Repeater
protected void repAnnualReport_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
        CurrentYear = int.Parse(((Literal)e.Item.FindControl("litLicenseYear")).Text);

        Repeater repLicenseLengths = (Repeater)e.Item.FindControl("repLicenseLengths");
        repLicenseLengths.DataSource = GetLicenseLengths(CurrentYear);
        repLicenseLengths.DataBind();
    }

    protected void repLicenseLengths_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
        CurrentLength = int.Parse(((Literal)e.Item.FindControl("litLicenseLength")).Text) * 365;

        Repeater repMonthlyReport = (Repeater)e.Item.FindControl("repMonthlyReport");
        repMonthlyReport.DataSource = new object[12];
        repMonthlyReport.DataBind();
    }

SaveCurrentItem = (CurrentItemClass)e.Item.DataItem;

protected void Repeater2_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
        {

            Repeater parentRepeater;

            // e.Item: the item/header/whatever template that kicked off this event
            // e.Item.NamingContainer: the owner of the item template (the innner repeater)
            // e.Item.NamingContainer.NamingContainer: the outer item template
            // e.Item.NamingContainer.NamingContainer.NamingContainer: the outer Repeater

            parentRepeater = (Repeater)e.Item.NamingContainer.NamingContainer.NamingContainer;

        }
    }