cevap:
char[] basamak = textBox1.Text.ToCharArray();
int enb = 0;
char enbc = Convert.ToChar(enb);
if (radioButton1.Checked)
{
for(int i = 0; i
if(basamak[i]> enbc)
{
enbc = basamak[i];
}
}
listBox1.Items.Add(enbc);
}