Parameters

header

A string containing the header to add, with the name and value separated by a colon.

Exceptions

Type	Reason
ArgumentNullException	header is null or string.Empty.
ArgumentException	header does not contain a colon (:) character. -or- name is string.Empty, or contains invalid characters. -or- header is a protected header that can only be set with a property accessor or by the system. -or- value contains invalid characters.

Remarks

This method inserts a new header into the list of header name/value pairs. header is required to be specified in the format name:value.

If the header specified in name is already present in the collection, value is concatenated with the existing value.

Requirements

Namespace: System.Net
Assembly: System (in System.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0