for server.mappath i add namespace system.web.ui even though i add the server.mappath does not comes

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C#

RptDoc.Load(Server.MapPath("~/CrystalReport.rpt"));

from the below code,when i type Server.MapPath is not coming.

u given the solution

system.web namespace for server.mapapth.

even though i add the namespace system.web the server.mappath does not comes please help me.is there any Reference want to add.

please help me.i try several times .

this is my code as follows

ReportDocument RptDoc = new ReportDocument();
RptDoc.Load(Server.MapPath("~/CrystalReport.rpt"));  
RptDoc.SetDataSource(dt);
CrystalReportViewer1.ReportSource = RptDoc;
CrystalReportViewer1.DataBind();

from the above code

RptDoc.Load(Server.MapPath("~/CrystalReport.rpt"));

this line Server.MapPath does not comes even though i add a system.web.ui namespace.