Trying to add a RowFilter to Datatable

Hi
I have a web part in Sharepoint 2007 that searches a Document Library.
I have a textbox so users can enter a Title and it works fine.

However I've just added a 'From' DateTimeControl and only wish to show documents which have a Publication Date greater than that.

However it seems to ignore my filter.

The Publication Date looks like this for example 26/7/2001

Any ideas?

Thanks

string query = "<Query><OrderBy><FieldRef Name='Title' /></OrderBy></Query>";
            string rowFilter = "";

            //DataTable spDataTable = ExecuteCamlQuery("Media Coverage Admin - Categories", query);
            DataTable spDataTable = ExecuteCamlQuery(sharePointListName, query);

            //set the filter to cope with the search criteria - restrict the search to a specific category
            if (ddlCategories.SelectedValue == "")
            {
                //DateTime theDT = new DateTime(2008, 1, 1);
                rowFilter = "Title LIKE '%" + tbSearch.Text + "%'";
                //"scheduled_completion_date < '" + System.DateTime.Now.ToString("MM/dd/yyyy") + "'"
            }
            else //dont restrict to specific category
            {
                rowFilter = "Title LIKE '%" + tbSearch.Text + "%' AND Category LIKE '%" + ddlCategories.SelectedValue + "%'";
            }

            //if there's just a 'from date'
            if (dtcFromDate.IsDateEmpty == false)
            {
                rowFilter += " AND Publication_x0020_Date >= '" + dtcFromDate.SelectedDate.ToString("dd/MM/yyyy") + "'";
            }

spDataTable.DefaultView.RowFilter = rowFilter;

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