Check Duplicates

I'm using following code which is not working to check duplicate values for "Revision Status"

private bool CheckRevision(string docType,string Revision)
        {
            bool Res = false;
            DataTable DT = new DataTable();
            DT = PinDicDAO.GetRevision(docType)开发者_如何学Python;
            DataView DV = new DataView(DT);
            DV.RowFilter = "RevisionStatus='" + Revision.Replace(" ", "") + "' OR RevisionStatus='"+Revision+"'";
            if (DV.Count > 0)
                Res = true;

            return Res;
        }

format of the RevisionStatus will be like

CN - Cancelled
IFP - Issued For Purchase

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Try to check the datatable instead.

if (DT.Rows.Count > 0)
                Res = true;

            return Res;