string s;
private void button1_Click(object sender, EventArgs e)
{
s = textBox1.Text;
string s1 = s.ToUpper();
textBox1.Text = s1;
}
private void button2_Click(object sender, EventArgs e)
{
s = textBox1.Text;
string s1 = s.ToLower();
textBox1.Text = s1;
}
private void button3_Click(object sender, EventArgs e)
{
Application.Exit();
}
C#字符串大小写转换
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转载自blog.csdn.net/qq_36636312/article/details/88662231
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