第1个回答 推荐于2016-09-15
private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
if((e.KeyChar>='0'&&e.KeyChar<='9')||(e.KeyChar>='A'&&e.KeyChar<='Z')||(e.KeyChar>='a'&&e.KeyChar<='z'))
e.Handled=false;
else
e.Handled=true;
}本回答被提问者采纳