How To Show Only Records That Belong To The Logged In User.

Hello.
I realize that this question has been asked before, but I still can't get it to work. Below are some links that might be of help:
http://forums.asp.net/p/1159666/1913519.aspx#1913519
http://forums.asp.net/p/1161930/1924264.aspx
http://forums.asp.net/p/1116601/1732359.aspx#1732359
http://forums.asp.net/t/1104718.aspx
http://forums.asp.net/p/1096290/1655706.aspx#1655706
http://forums.asp.net/p/1110162/1707952.aspx#1707952


 
Basically, I need a DropDownList to display only projects for which the logged in user is assigned as leader. The [Projects] table contains an integer ProjectId, a string ProjectName, a uniqueidentifier ProjectLeader, and other fields. Can someone help me with the SQL query and code?
 * Here is the definition of the SqlDataSource: <asp:SqlDataSource ID="SqlDataSource5" runat="server" ConnectionString="<%$ ConnectionStrings:ASPNETDB.MDFConnectionString %>"
SelectCommand="SELECT [ProjectId], [ProjectName] FROM [Projects] WHERE ([ProjectLeader] = @Leader)" OnSelecting="SqlDataSource5_Selecting">
<SelectParameters>
<asp:Parameter Name="Leader" Type="Object" />
</SelectParameters>
</asp:SqlDataSource>  * Here is the definition of the SqlDataSource5_Selecting method:   protected void SqlDataSource5_Selecting(object sender, SqlDataSourceSelectingEventArgs e)
{
e.Command.Parameters("@Leader").Value = loggedInUserId;
} where loggedInUserId is a global variable of type System.Guid. It has been evaluated in the Page_Load event to as: loggedInUserId = (System.Guid)Membership.GetUser().ProviderUserKey; Now the first problem I encounter is that when I run the page, the compiler complains and says, "error CS0118: 'System.Data.Common.DbCommand.Parameters' is a 'property' but is used like a 'method'." The second problem is when I insert the line: SqlDataSource5.SelectParameters("Leader").DefaultValue = loggedInUserId; in page_Load. The compiler again says, "error CS0118: 'System.Data.Common.DbCommand.Parameters' is a 'property' but is used like a 'method'."
 I've spent a long time trying to figure it out, but could not solve it. I would appreciate it if someone can help me out. Thank you very much.