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TaskDialog.Title

Description:
Title of the task dialog.

Remarks:

Titles of task dialogs should be unique. Do not reuse the same title for multiple task dialogs.

Newline characters are not allowed in Title.

When the dialogs is shown, Revit will put "External Command Name –" or "External Application –" in the front of the value by default. Examples:

Plug-in Name – No Rooms to Calculate
Plug-in Name – Invalid Value for Length

You can suppress it by setting TitleAutoPrefix to false.

Titles should describe the nature of the problem or state the situation that currently exists. The title tells the user why they are getting the message, not what they are supposed to do.

public string Title { get; set; }

Public Property Title As String
Get
Set

public:
property String^ Title {
	String^ get ();
	void set (String^ value);
}

Autodesk.Revit.Exceptions.ArgumentNullException

Thrown when setting the value tonullNothingnullptra null reference (Nothingin Visual Basic).
Autodesk.Revit.Exceptions.ArgumentException

Thrown when setting the value to an empty string or string contains newline characters.