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WebHeaderCollection.Add Method (String, String)

Inserts a header with the specified name and value into the collection.

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

public override void Add(
	string name,
	string value
)

Parameters

name
Type: System.String

The header to add to the collection.

value
Type: System.String

The content of the header.

ExceptionCondition
ArgumentException

name is null, Empty, or contains invalid characters.

-or-

name is a restricted header that must be set with a property setting.

-or-

value contains invalid characters.

ArgumentOutOfRangeException

The length of value is greater than 65535.

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

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

The following example adds a name/value pair to a WebHeaderCollection using the Add Method.

		try {
			//Create a web request for "www.msn.com".
		 	HttpWebRequest myHttpWebRequest = (HttpWebRequest) WebRequest.Create("http://www.msn.com");

			//Get the headers associated with the request.
			WebHeaderCollection myWebHeaderCollection = myHttpWebRequest.Headers;

			Console.WriteLine("Configuring Webrequest to accept Danish and English language using 'Add' method");

			//Add the Accept-Language header (for Danish) in the request.
			myWebHeaderCollection.Add("Accept-Language:da");

			//Include English in the Accept-Langauge header. 
			myWebHeaderCollection.Add("Accept-Language","en;q=0.8");

			//Get the associated response for the above request.
		 	HttpWebResponse myHttpWebResponse = (HttpWebResponse) myHttpWebRequest.GetResponse();

			//Print the headers for the request.
			printHeaders(myWebHeaderCollection);
			myHttpWebResponse.Close();
		}
		//Catch exception if trying to add a restricted header. 
		catch(ArgumentException e) {
			Console.WriteLine(e.Message);
		}
		catch(WebException e) {
			Console.WriteLine("\nWebException is thrown. \nMessage is :" + e.Message);
			if(e.Status == WebExceptionStatus.ProtocolError) {
				Console.WriteLine("Status Code : {0}", ((HttpWebResponse)e.Response).StatusCode);
				Console.WriteLine("Status Description : {0}", ((HttpWebResponse)e.Response).StatusDescription);
				Console.WriteLine("Server : {0}", ((HttpWebResponse)e.Response).Server);
			}
		}
		catch(Exception e) {
			Console.WriteLine("Exception is thrown. Message is :" + e.Message);
		}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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