tolower

Today in C#, I will teach you how to create a program that changes case either uppercase or lowercase letters using C#. Now, let's start this tutorial! 1. Let's start with creating a Windows Form Application for this tutorial by following the following steps in Microsoft Visual Studio 2010: Go to File, click New Project, and choose Windows Application. 2. Next, add two Buttons named Button1 and labeled it as "Uppercase" and Button2 labeled as "Lowercase".