This version of the RichTextBox.Find(string) method searches for the first instance of a character from a list of characters specified in the characterSet parameter and returns the location of the character. For example, you pass an array of characters containing the character 'Q'. If the control contained the text "The Quick Brown Fox", the RichTextBox.Find(string) method would return the value of four. An upper case character and a lower case character are considered different values in the search.

If the property returns a negative value, the characters being searched for were not found within the contents of the control. You can use this method to search for a group of characters within the control. If a character from the character list provided in the method's characterSet parameter is found, the value returned by this method is a zero based index of the character's position in the control. A space is considered a character by the method when determining the location of a character.

This version of the RichTextBox.Find(string) method enables you to search for a character set from a range of text in the control by specifying a value for the start and end parameters. A value of zero for the start parameter indicates that the search should start from the beginning of the control's document. A -1 value for the end parameter indicates that the search should end at the end of the text within the control. You can use this version of the RichTextBox.Find(string) method to narrow your search to a specific range of text within the control to avoid searching areas of the document that are not important to the needs of your application.

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