Method WriteDocType

When overridden in a derived class, writes the DOCTYPE declaration with the specified name and optional attributes.

public override void WriteDocType(string name, string pubid, string sysid, string subset)

name string: The name of the DOCTYPE. This must be non-empty.
pubid string: If non-null it also writes PUBLIC "pubid" "sysid" where pubid and sysid are replaced with the value of the given arguments.
sysid string: If pubid is null and sysid is non-null it writes SYSTEM "sysid" where sysid is replaced with the value of this argument.
subset string: If non-null it writes [subset] where subset is replaced with the value of this argument.

InvalidOperationException: This method was called outside the prolog (after the root element).
ArgumentException: The value for name would result in invalid XML.
InvalidOperationException: An XmlWriter method was called before a previous asynchronous operation finished. In this case, InvalidOperationException is thrown with the message “An asynchronous operation is already in progress.”