Span<Char>using System;
var str = "A";
Console.WriteLine(str); // A
unsafe
{
fixed (char* chars = &str.GetPinnableReference())
{
chars[0] = 'B';
}
}
Console.WriteLine(str); // BInt32.TryParse(textBox1.Text, out var text);
Int32.TryParse(textBox2.Text, out var text2);
Int32.TryParse(textBox3.Text, out var text3);