Display Name Problem for .rdlc report

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ASP.NET

RDLC

Hello

I am using .rdlc report. I have to generate pdf with dynamic names from my report.
For this i am using

DataView dv =(DataView) ObjectDataSource2.Select();
        String st = "";
        DataTable tb = dv.Table;
        if (tb.Rows.Count > 0)
        {
//assigning QUOTATION_NUMBER from table to st
            st = tb.Rows[0]["QUOTATION_NUMBER"].ToString();
            
        }
        
        ReportViewer1.LocalReport.DisplayName = st;

Now problem is that if My QUOTATION_NUMBER is IMP-20110620-7, it is showing IMP%2D20110620%2D7 .
(i.e. replace '-' with '%2D' )
Whaen i check display name while executing it show IMP-20110620-7, but showing IMP%2D20110620%2D7 on pdf.

Can anyone please suggest me how to do this.

Thanks in advance.