Need Help with ItemDataBound

Question

Hey Everyone! 

Hope you guys can help me with this. I am trying to format a datalist with the month name as headers. The issue I am facing is that the code is hiding some of the rows but I am unable to figure out why. The datasource returns 25 records without the ItemDataBound command and when I add the ItemDatabound code I get about 17 records. Basically if the name of the month is the same it should only display once and hide the duplicate month names. Here's what I have so far: 

protected void DataList1_ItemDataB(object sender, System.Web.UI.WebControls.DataListItemEventArgs e)     {          if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item)         {             string strval = ((Label)(e.Item.FindControl("lblMP"))).Text;             string month = ViewState["DateAdded"] as string;             ;              if (month == strval)             {                 ((Label)(e.Item.FindControl("lblMP"))).Text = "";                 e.Item.Visible = false;             }              else             {                 month = strval;                 ViewState["DateAdded"] = month;                 ((Label)(e.Item.FindControl("lblMP"))).Text = month;                 Panel pnlMonth = (Panel)e.Item.FindControl("pnlMonth");                 pnlMonth.Visible = true;                 e.Item.Visible = true;              }          }     }

Any ideas?