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visible attribute of panel and label controls

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I have a page where I have multiple button events that give access to a customer database. Each button event offers a different search criteria to access customer info. This page is not the problem. The problem comes in the results page where I have multiple gridview controls that receive the info. Actually I just have two at the moment; I stopped there because of my problem, which I've tried everything I can think of to solve.

Everything works fine except that the visible attributes of the panel and label controls are not working properly. When I have just one GridView control, everything works fine. When I put the second GridView control, the panel and label controls that I have set to "false" in my code behind are becoming visible. I've tried so many variations, but nothing works. I tried try/catch, if statements, but with those coding statements it seems top be worse. Even with one GridView control, the labels I want to become visible, don't when using statements. 

I don't know if I made this clear for anyone to help me, but if anyone has a suggestion, I am all ears!!! 

Thanks so much for any help!

Here's my results.aspx page code that receives the request...

<asp:Panel ID="plLastName" Visible="false" CssClass="ParaText" runat="server">
<div class="welcomeHeader" runat="server">
   <h4><asp:Label ID="lblSearchCriteria1" runat="server" Visible="false" Text="Here are your search results for 'Last Name'..."></asp:Label></h4>
</div>

<br />

<asp:GridView ID="GridView1" HeaderStyle-BackColor="#006699" runat="server" AutoGenerateColumns="False">
   <Columns>
      <asp:BoundField DataField="FirstName" HeaderText="First Name" HeaderStyle-CssClass="ParaTextWhite" SortExpression="FirstName" />
      <asp:BoundField DataField="LastName" HeaderText="Last Name" HeaderStyle-CssClass="ParaTextWhite" SortExpression="LastName" />
      <asp:BoundField DataField="CustomerId" HeaderText="Customer Id" HeaderStyle-CssClass="ParaTextWhite" InsertVisible="False" ReadOnly="True" SortExpression="CustomerId" />
      <asp:BoundField DataField="StreetAddress" HeaderText="Street Address" HeaderStyle-CssClass="ParaTextWhite" SortExpression="StreetAddress" />
      <asp:BoundField DataField="City" HeaderText="City" HeaderStyle-CssClass="ParaTextWhite" SortExpression="City" />
      <asp:BoundField DataField="State" HeaderText="State" HeaderStyle-CssClass="ParaTextWhite" SortExpression="State" />
      <asp:BoundField DataField="ZipCode" HeaderText="Zip Code" HeaderStyle-CssClass="ParaTextWhite" SortExpression="ZipCode" />
      <asp:BoundField DataField="Phone" HeaderText="Phone" HeaderStyle-CssClass="ParaTextWhite" SortExpression="Phone" />
      <asp:BoundField DataField="Email" HeaderText="Email" HeaderStyle-CssClass="ParaTextWhite" SortExpression="Email" />
   </Columns>
</asp:GridView>


<asp:Label ID="lblErrorMessage1" CssClass="ParaTextRed" Visible="false" runat="server" Text="<img src='../Images/design/status-red-check-unavailable.jpg' style='vertical-align:middle;' /> <span class='ParaTextRed'>Cannot Find Customer! Please be sure you have typed the last name correctly.</span>"></asp:Label>
</asp:Panel>


<asp:Panel ID="plUserName" Visible="false" CssClass="ParaText" runat="server">
<div class="welcomeHeader" runat="server">
   <h4><asp:Label ID="lblSearchCriteria2" runat="server" Visible="false" Text="Here are your search results for 'Username'..."></asp:Label></h4>
</div>

<br />

<asp:GridView ID="GridView2" HeaderStyle-BackColor="#006699" runat="server" AutoGenerateColumns="False">
   <Columns>
      <asp:BoundField DataField="FirstName" HeaderText="First Name" HeaderStyle-CssClass="ParaTextWhite" SortExpression="FirstName" />
      <asp:BoundField DataField="LastName" HeaderText="Last Name" HeaderStyle-CssClass="ParaTextWhite" SortExpression="LastName" />
      <asp:BoundField DataField="CustomerId" HeaderText="Customer Id" HeaderStyle-CssClass="ParaTextWhite" InsertVisible="False" ReadOnly="True" SortExpression="CustomerId" />
      <asp:BoundField DataField="StreetAddress" HeaderText="Street Address" HeaderStyle-CssClass="ParaTextWhite" SortExpression="StreetAddress" />
      <asp:BoundField DataField="City" HeaderText="City" HeaderStyle-CssClass="ParaTextWhite" SortExpression="City" />
      <asp:BoundField DataField="State" HeaderText="State" HeaderStyle-CssClass="ParaTextWhite" SortExpression="State" />
      <asp:BoundField DataField="ZipCode" HeaderText="Zip Code" HeaderStyle-CssClass="ParaTextWhite" SortExpression="ZipCode" />
      <asp:BoundField DataField="Phone" HeaderText="Phone" HeaderStyle-CssClass="ParaTextWhite" SortExpression="Phone" />
      <asp:BoundField DataField="Email" HeaderText="Email" HeaderStyle-CssClass="ParaTextWhite" SortExpression="Email" />
   </Columns>
</asp:GridView>


<asp:Label ID="lblErrorMessage2" CssClass="ParaTextRed" Visible="false" runat="server" Text="<img src='../Images/design/status-red-check-unavailable.jpg' style='vertical-align:middle;' /> <span class='ParaTextRed'>Cannot Find Customer! Please be sure you have typed in the username correctly.</span>"></asp:Label>
</asp:Panel>

-----------------------

Now here is my code behind (I've noted in the code with comments that all the codes below that designate the Visible attribute work as I have coded them, but all become visible even when I code them to be false either in the main page or the code behind...

protected void Page_Load(object sender, EventArgs e)
{
   DataTable dt1 = GetData1();
   GridView1.DataSource = dt1;
   GridView1.DataBind();

   DataTable dt2 = GetData2();
   GridView2.DataSource = dt2;
   GridView2.DataBind();
}

private string GetCache1()
{
string cachedString1;
cachedString1 = (string)Cache["cacheLastName"];
return cachedString1;
}

private string GetCache2()
{
   string cachedString2;
   cachedString2 = (string)Cache["cacheUserName"];
   return cachedString2;
}


private DataTable GetData1()
{
   string lastname = GetCache1();

   using (SqlConnection con = new SqlConnection(connectionString))
   {
      using (SqlCommand cmd1 = new SqlCommand("SELECT CustomerId,FirstName,LastName,StreetAddress,City,State,ZipCode,Phone,Email FROM Customers WHERE LastName='" +           lastname + "'", con))
      {
         plLastName.Visible = true; //**This works
         lblSearchCriteria1.Visible = true; //**This Works
         DataTable dt1 = new DataTable();
         SqlDataAdapter da1 = new SqlDataAdapter(cmd1);
         da1.Fill(dt1);
         if (dt1.Rows.Count == 1)
         {
           return dt1;
         }
         else

         {
            lblErrorMessage1.Visible = true; //**This Works
            return dt1;
         }
      }
   }
}

private DataTable GetData2()
{
   string username = GetCache2();

   using (SqlConnection con = new SqlConnection(connectionString))
   {
      using (SqlCommand cmd2 = new SqlCommand("SELECT CustomerId,FirstName,LastName,UserName,StreetAddress,City,State,ZipCode,Phone,Email FROM Customers WHERE                 UserName='" + username + "'", con))
     {
        plUserName.Visible = true; //**This works
        lblSearchCriteria2.Visible = true; //**This works
        DataTable dt2 = new DataTable();
        SqlDataAdapter da2 = new SqlDataAdapter(cmd2);
        da2.Fill(dt2);
        if (dt2.Rows.Count == 1)
        {
           return dt2;
        }
        else
        {
           lblErrorMessage2.Visible = true; //**This works
           return dt2;
         }
     }
   }
}


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