Set SelectParameter for SqlDataSource SelectCommand with unknown ammount of variables

"

    SelectCommand="SELECT *
                     FROM Date AS t1 FULL OUTER JOIN (SELECT * FROM WorkHoursEntry WHERE (WorkerID LIKE @WorkerID)) AS t2 ON t1.PKDate = t2.WorkDay 
                     LEFT OUTER JOIN Worker AS t3 ON t2.WorkerID = t3.WorkerID 
                     LEFT OUTER JOIN (SELECT * FROM Project WHERE ProjectID IN(@Project)) AS t4 ON t2.ProjectID = t4.ProjectID"
                     FilterExpression="YearMonth IN({0})"
                     >
             <FilterParameters>
                 <asp:ControlParameter ControlID="yearMonthFilterLabel" Name="YearMonth" 
                     PropertyName="Text" Type="String" />
             </FilterParameters>
             <SelectParameters>
                     <asp:ControlParameter ControlID="WorkerIDLabel" Name="WorkerID" 
                     PropertyName="Text" Type="String" />
                     <asp:ControlParameter ControlID="projectFilterLabel" Name="Project" 
                     PropertyName="Text" Type="String" />
             </SelectParameters>
         </asp:SqlDataSource>
 

Greetings, I have problem with @Project ControlParameter, problem is I don't know how to pass several values and FilterParameters method won't work as I want. Is there any way to pass several variables ? (without using c#).

projectFilterLabel.Text = 'aaa, bbb, ccc';
 

Basically what I want to do is to select all values from Date table and join them with some values from Project table and output to DataList.

Any help appreciated, I just started learning asp.net

Thanks.

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