public void Add(
	string name,
	string value
)

Parameters

name

Type: SystemString
The name of the header that is being added to the collection.

value

Type: SystemString
The content of the header that is being added (its header-value). If a header with the specified name already exists, this value is concatenated onto the existing header.

Throws an exception if the specified header name is the name of a special header.

Reference