Conversion failed when converting the varchar value '@ReferralID' to data type int.

i am trying to do assign the referralID in
        if (!this.IsPostBack)

            this.SqlDataSource3.SelectParameters["ReferralID"].DefaultValue = Request.QueryString["r"];


I have a dropdown list pulling data from a database.

 <asp:SqlDataSource ID="SqlDataSource3" runat="server" SelectCommand="select WeekID, WeekUpdate from tbl_WeekUpdate where WeekID not in (SELECT WeekUpdate from tbl_StatusTracking10th where ReferralID = '@ReferralID' )" ConnectionString="<%$ ConnectionStrings:TestConnectionString %>" >
        <asp:Parameter DefaultValue="-1"  Name="ReferralID" />

I receive this error.
Conversion failed when converting the varchar value '@ReferralID' to data type int.

Any suggestion
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Deepak ChauhanSQL Server DBACommented:
Try this

(SELECT WeekUpdate from tbl_StatusTracking10th
where cast(ReferralID as varchar(50)) = '@ReferralID' )"
shpresaAuthor Commented:
it solved the error but the sql query does not seem to recognize referralID. ReferralID is a int number.
Deepak ChauhanSQL Server DBACommented:
remove the ' ' from @ReferralID

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