permission in studio 2008 reports

[System.Security.SecurityException] {
"Request for the permission of type 'System.Data.SqlClient.SqlClientPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed."
} System.Security.SecurityException

System.Data.SqlClient.SqlClientPermission(System.Security.Permissions.PermissionState.Unrestricted).Assert();

reportViewer.LocalReport.ExecuteReportInCurrentAppDomain(System.Reflection.Assembly.GetExecutingAssembly().Evidence);