SqlDataSource with Guid Parameter - asp.net

Question

I have this sqlDataSource
#userId is my parameter for Current user in a system .
<asp:SqlDataSource ID="dsProfit" runat="server" ConnectionString="<%$ ConnectionStrings:DefaultConnection %>" SelectCommand="select name, sum(value) as suma from AllProfitView where IdUser=#userId group by name order by sum(value) desc">
</asp:SqlDataSource>
In code Behind I have this in Page_Load :
dsProfit.SelectParameters.Add("#userId", cui.getCurrentId());
public Guid getCurrentId()
{
MembershipUser currentUser = Membership.GetUser();
Guid currentUserId = (Guid)currentUser.ProviderUserKey;
return currentUserId;
}
when start the page it's blows with ERROR :Must declare the scalar variable "#userId".

Answer 1

Add SelectParameter to your sqlDataSource
<asp:SqlDataSource ID="dsProfit" runat="server"
ConnectionString="<%$ ConnectionStrings:DefaultConnection %>"
SelectCommand="select name, sum(value) as suma from AllProfitView
where IdUser=#userId group by name order by sum(value) desc">
<SelectParameters>
<asp:Parameter Name="userId" Type="String" />
</SelectParameters>
</asp:SqlDataSource>
and assign likes this
dsProfit.SelectParameters["userId"].DefaultValue =
cui.getCurrentId().ToString();

Answer 2

try to define selectparameter inside of your SqlDatasource
<asp:SqlDataSource ID="dsProfit" runat="server" ConnectionString="<%$ ConnectionStrings:DefaultConnection %>" SelectCommand="select name, sum(value) as suma from AllProfitView where IdUser=#userId group by name order by sum(value) desc">
<SelectParameters>
<asp:Parameter Name="userId" Type="int32" />
</SelectParameters>
</asp:SqlDataSource>
so your parameter is int so convert it to string
dsProfit.SelectParameters["userId"].DefaultValue = cui.getCurrentId().toString();