Moving a select statement from aspx file to .cs file

Hello,
I'm using c#, .net for my application and connecting to SQL 2012.

I'm having a hard time finding information on how to move this SQLDataSource select statement to the code code behind C# file and referencing it in my aspx page.
This is the reference in my aspx file.  How do I move the select statement to my .cs file?

<asp:SqlDataSource ID="SqlDS" runat="server" 
 ConnectionString="<%$ ConnectionStrings:MyConnectionString %>" 
SelectCommand="SELECT S.IsActive, S.Title, S.AllowTransfer, S.GuestFee 
FROM Sessions S WHERE (IsActive = 'True') AND (AllowTransfer = 'True')">
                    </asp:SqlDataSource>

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Thanks for looking at this.