<asp:LoginName> tag value, used as parameter in SqlDataSource ???

Hi,

Wondering, is there a way I can ...
Use the UserName value that is returned from Code Snippet One (the asp:LoginName tag)

and use it as a parameter in my SqlDataSource later on the page ...
I basically need the userName obtained from the LoginName tag placed in code Snippet 2 at the marker _Parameter, but have been unable to achieve this so far, I've tried it a couple of ways ... like this ... and also in the code, but have encounted no success.

any Ideas?

Code Snippet One:
    <asp:LoginView ID="LoginView1" runat="server">
        <LoggedInTemplate>
            UserName&nbsp;&nbsp;<asp:LoginName ID="LoginName1" runat="server" />
        </LoggedInTemplate>
    </asp:LoginView>
    <p>Please select a folder to upload your file to.  <b>If no folder is selected file will be placed in the default folder.</b></p>
    <asp:GridView ID="GridView_FolderName_Selector" runat="server" AutoGenerateColumns="False" AllowPaging="False" 
    DataSourceID="SqlDataSource1">
        <Columns>
            <asp:TemplateField HeaderText="Selection">
                <ItemTemplate>
                    <asp:CheckBox ID="FolderNameSelector" runat="server" />
                </ItemTemplate>
            </asp:TemplateField>
            <asp:BoundField DataField="FolderName" HeaderText="FolderName" 
            SortExpression="FolderName" />
        </Columns>
    </asp:GridView>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
    ConnectionString="<%$ConnectionStrings:LocalSqlServer%>" 
    SelectCommand="SELECT [FolderName] FROM [FolderPermissions] WHERE UserName = _Parameter"></asp:SqlDataSource>

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