how to pass values or data from parent datalist to child datalist

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ASP.NET

hi all
ok let me explain my problem. i have two datalists on same page parendl and childdl parentdl has some initial info of all the records having a view details button when user clicks on view details button of an particular record then all the info of that record clicked should be display on child datalist
i know how to pass values from one page to another which some thing like

protected void datalist_ItemCommand(object source, datalistCommandEventArgs e)
    {
        if (e.CommandName == "details")
        {
            Response.Redirect("./Repeater_DataSource.aspx?house_id=" + e.CommandArgument);

        }
    }

but i don't know how to pass values from parent datalist to child datalist within same window
i will deeply appreciate if some one could come up with an example
thanks