Crystal report asking username and password But I am Using Windows Authentication

[el rey003]

ReportDocument crystalReport = new ReportDocument();
crystalReport.Load(Server.MapPath("~/CrystalReport1.rpt"));
crystalReport.SetDataSource(DBB.LIST("External").ToList());
crystalReport.DataSourceConnections[0].SetConnection(@".\SQLEXPRESS", "DB", true);
CrystalReportViewer1.ReportSource = crystalReport;

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