Dont display message "Enter Values" when printing crytal report

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ASP.NET

reporting

Dear all,

Please help me to prevent message "Enter Values" (attached picture: http://upanh.in/Yys.jpg) when I print report.

Please see code:

<CR:CrystalReportViewer ID="rptViewer"  runat="server" AutoDataBind="true" ToolPanelView="None"/>

string sReport = "~/PhieuBanHang.rpt";
int iMaNhapXuat = 1; 
               
ParameterFields myParams = new ParameterFields();
ParameterField myParam = new ParameterField();
ParameterDiscreteValue myDiscreteValue = new ParameterDiscreteValue();
myParam.ParameterFieldName = "MaNhapXuat";
myDiscreteValue.Value = iMaNhapXuat;
myParam.CurrentValues.Add(myDiscreteValue);
myParams.Add(myParam);
rptViewer.ParameterFieldInfo = myParams;
                
ReportDocument report = new ReportDocument();
report.Load(Server.MapPath(sReport));
report.SetDatabaseLogon("Account", "Password", "IP Address", "Database");
rptViewer.ReuseParameterValuesOnRefresh = true;  
rptViewer.ReportSource = report;