Use the CharacterCasing property of the TextBox.
[C#]
textBox1.CharacterCasing = CharacterCasing.Upper;
textBox2.CharacterCasing = CharacterCasing.Lower;
Use the CharacterCasing property of the TextBox.
[C#]
textBox1.CharacterCasing = CharacterCasing.Upper;
textBox2.CharacterCasing = CharacterCasing.Lower;
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