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Implementing 'Change Case' feature

Author:	TX Text Control Support Department
Language:	Visual Basic .NET
Version:	1.0
Released:	March 16, 2005
Last modified:	January 11, 2008
Requirements:	TX Text Control .NET with Visual Basic .NET
Download code:	case_change.zip [8.18 KB, ZIP]

Implementing a 'Change Case' feature with TX Text Control

A desirable feature of a word processing application is to change the case of a word, sentence or entire document.

This .NET based sample application illustrates how to implement the different cases known from Microsoft Word.

We are going to implement the following case changes:

Sentence case
lower case
UPPER CASE
Title Case
toGGLE cASE

The implementation is really simple. We just loop through the selected text and replace the current character with its newly specified case. If the current character is to be converted to an upper case character, it is replaced using this simplified code:

selChar = TextControl1.Selection.Text
If selChar.IsLetter(selChar) = True Then
	TextControl1.Selection.Text = selChar.ToUpper(selChar)
End If

The Char namespace of .NET offers the functions toUpper and toLower that can be used to change the case of characters.

In the sample application, you will see how the other cases are implemented and which constraints need to be followed.

The minimum requirements for this sample application are TX Text Control .NET trial version and Visual Studio .NET 2003.

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