Crystal Report Print Button Not Working ..

Question

Dear Friends ,

                  I am New to crystal report. I have create for one Table through the CrystalReportViewer . I made to displayed corresponding 

Data.But when i try to click the print button.It gives me error.I couldn't come out from this problem. The following code which i was used 

in my application..

              If possible guide me Anyone  ..Thanks in Advance

Code :

public void loadcry()

    {

        string ppp = string.Empty;

        ppp = txtPONo.Text.Trim();

        SqlConnection Cn = new SqlConnection(StrCon);

        SqlDataAdapter Ada = new SqlDataAdapter("select * from PORECEIPTMASTER WHERE PONO='" + ppp + "'", Cn);

        //DataTable dt = new DataTable();

        DataSet Ds = new DataSet();

        Ada.Fill(Ds);

        rep = new ReportDocument();

        rep.Load(Server.MapPath("~/CrystalRptPOReceipt.rpt"));

       

        rep.SetDataSource(Ds.Tables[0]);

        rptPOReceipt.ReportSource = rep;

        rep.PrintToPrinter(1, true, 0, 0);

        rptPOReceipt.DataBind();

        rptPOReceipt.RefreshReport();

    }

Error:

Logon failed. Details: ADO Error Code: 0x Source: Microsoft SQL Native Client Description: Login failed for user 'sa'. SQL State: 28000 Native Error: Error in File C:\DOCUME~1\admin\LOCALS~1\Temp\CrystalRptPO {16D53BA4-8103-47CB-8220-306EC1F13D59}.rpt: Unable to connect: incorrect