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WebHeaderCollection.Add Method (HttpRequestHeader, String)

Inserts the specified header with the specified value into the collection.

Namespace:  System.Net
Assembly:  System (in System.dll)

public void Add(
	HttpRequestHeader header,
	string value
)

Parameters

header
Type: System.Net.HttpRequestHeader

The header to add to the collection.

value
Type: System.String

The content of the header.

ExceptionCondition
ArgumentOutOfRangeException

The length of value is greater than 65535.

InvalidOperationException

This WebHeaderCollection instance does not allow instances of HttpRequestHeader.

If the specified header does not exist, the Add method inserts a new header into the list of header name/value pairs.

If the specified header is already present, value is added to the comma-separated list of values associated with the header.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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