Question

How to change character casing in TextBox? I need that 1 line character been Upper and second line character benn Lower

isv.CharacterCasing = CharacterCasing.Upper;
isv.Text = "Upper"

isv.CharacterCasing = CharacterCasing.Lower;
isv.Text = "Lower"

Answer 1

As Mark said, it’s difficult to understand exactly what you need, but I think it’s something like

string[] lines = isv.Text.Split('\n');
string finalText = string.Empty;
for (int i = 0; i < lines.length; i++)
    finalText += i%2==0 ? lines[i].ToUpper() : lines[i].ToLower() +  + Environment.NewLine;
isv.Text = finalText;

Keep in mind I wrote the code without the compiler 🙂