checking for null values

protected void rptNavigation_ItemDataBound(object sender, System.Web.UI.WebControls.RepeaterItemEventArgs e)
    {
        if (!((e.Item.ItemType == ListItemType.AlternatingItem) || (e.Item.ItemType == ListItemType.Item)))
        {
            return;
        }


        string Name = string.Empty;
        if (IsDBNull(e.Item.DataItem["FullName"])) {
            Name = String.Empty;
        }
        else {
            Name = (string)(e.Item.DataItem["FullName" ...