Microsoft® Visual Basic® .NET Programmer's Cookbook

Change the Case of All Characters in a String

Problem

You want to capitalize or de-capitalize all letters in a string.

Solution

Use the ToUpper or ToLower method of the String class.

Discussion

ToUpper method returns a new string that is all uppercase. The ToLower method returns a new string that is all lowercase.

Dim MixedCase, UpperCase, LowerCase As String
MixedCase = "hELLo"

UpperCase = MixedCase.ToUpper()
' UpperCase is now "HELLO"

LowerCase = MixedCase.ToLower()
' LowerCase is now "hello"

If you want to operate on only part of a string, split the string as described in recipe Retrieve a Portion of a String, call ToUpper or ToLower on the appropriate substring, and then join the strings back together.