C#

System.IO.IOException: Unable to write data to the transport connection: An established connection was aborted by
 the software in your host machine. ---> System.Net.Sockets.SocketException: An established connection was 
aborted by the software in your host machine
   at System.Net.Sockets.Socket.Send(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
   at System.Net.Sockets.NetworkStream.Write(Byte[] buffer, Int32 offset, Int32 size)
   --- End of inner exception stack trace ---
   at System.Net.Sockets.NetworkStream.Write(Byte[] buffer, Int32 offset, Int32 size)
   at System.IO.BinaryWriter.Write(Byte[] buffer)

<?xml version="1.0" encoding="utf-8"?><br />
<StaffingOrganization xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://ns.hr-xml.org/2006-02-28 StaffingOrganization.xsd HR-XMLExtension.com AccountExtension.xsd" typeOfOrganization="Customer" xmlns="http://ns.hr-xml.org/2006-02-28"><br />
	<Organization><br />
		<OrganizationName></OrganizationName><br />
		<OrganizationId><br />
			<IdValue name=""></IdValue><br />
		</OrganizationId><br />
		<ContactInfo><br />
			<ContactMethod><br />
				<Telephone><br />
					<FormattedNumber></FormattedNumber><br />
				</Telephone><br />
				<InternetEmailAddress ></InternetEmailAddress><br />
				<InternetWebAddress ></InternetWebAddress><br />
				<PostalAddress><br />
					<CountryCode></CountryCode><br />
					<PostalCode></PostalCode><br />
					<Region></Region><br />
					<Municipality></Municipality><br />
					<DeliveryAddress><br />
						<AddressLine></AddressLine><br />
						<BuildingNumber></BuildingNumber><br />
					</DeliveryAddress><br />
				</PostalAddress><br />
			</ContactMethod><br />
		</ContactInfo><br />
	</Organization><br />
	<ReferenceIdInfo><br />
		<StaffingCustomerId><br />
			<IdValue name=""></IdValue><br />
		</StaffingCustomerId><br />
		<StaffingCustomerOrgUnitId><br />
			<IdValue name="Branch"></IdValue><br />
			<IdValue name="BranchName"></IdValue><br />
		</StaffingCustomerOrgUnitId><br />
	</ReferenceIdInfo><br />
	<UserArea><br />
		<CompanyExtn xmlns="HR-XMLExtension.com"><br />
			<WorkPeriodEndingDay></WorkPeriodEndingDay><br />
			<TimesheetMeasurement></TimesheetMeasurement><br />
			<ReportInterval></ReportInterval><br />
			<AllowEmployeeRevision></AllowEmployeeRevision><br />
			<AllowExpenses></AllowExpenses><br />
			<AllowApproverRevisions></AllowApproverRevisions><br />
			<TimesheetBranch ></TimesheetBranch><br />
			<ApproverName></ApproverName><br />
			<JobDescription></JobDescription><br />
			<Corporation ></Corporation><br />
			<MainOccupation ></MainOccupation><br />
			<EmploymentType ></EmploymentType><br />
			<TimeSheetFormat><br />
				<Name></Name><br />
			</TimeSheetFormat><br />
			<WorkingDays></WorkingDays><br />
		</CompanyExtn><br />
	</UserArea><br />
</StaffingOrganization>

if (ReferenceEquals(curve, null))
{
    // do something
}

if (curve == null)
{
    // do something
}