Passing variables in a XML Datasource & Datalist

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ASP.NET

I have an assignment where I am making a rss reader. I have a search text box that allows the user to enter a word and then click a button to search for those key words. The hard coded example search for "asp". I can't figure out how to pass my textbox variable into that string. Any help would be great!

string sTmp = "";
    string sSearch = "";


    //gets the value from the text box
    sSearch = txtSearch.Text;

    //hard coded sample give to me. it works.
    sTmp = "[contains(title, 'asp']";

    //my attempt at passing the variable above to the sTmp variable.
    //I have tried several variations of this with no luck
    sTmp = "[contains(title, 'sSearch']";

    UpdatePanel2.ContentTemplateContainer.Controls.Clear();

    xmlDViewOne.DataFile = @"rss.xml";
    xmlDViewOne.XPath = @"rss/channel/item " + sTmp;
    xmlDViewOne.DataBind();

    dtlDisplay.DataSource = xmlDViewOne;
    dtlDisplay.DataBind();

Thanks in advance,
Brian