Programmatically Apply the filter to SharePoint List Default View

string tempQuery= "<Where><Eq><FieldRef  Name=\"Title\"/>"+
         "<Value Type=\"Text\">xyz</Value></Eq></Where>;


SPList listView= oWeb.Lists[listName];



for(int i = 0; i < listView.Views.Count; i++)
{

    //Get the view
    SPView view = listViewActual.Views[i];

    if(view.DefaultView)
    {
       oWeb.AllowUnsafeUpdates = true;

        view.Query = tempQuery;
        view.Update();
        oWeb.AllowUnsafeUpdates = false;

    }
}