实例1 如何使用错误提醒控件

 1 private void button1_Click(object sender, EventArgs e)
 2         {
 3             this.errorProvider1.Clear();
 4             if (this.textBox1.Text.Length<6||this.textBox1.Text.Length>12)
 5             {
 6                 this.errorProvider1.SetError(this.textBox1, "输入有误");
 7                 DialogResult dialogresult = MessageBox.Show("你的输入有误", "Error", MessageBoxButtons.OKCancel);
 8                 switch (dialogresult)
 9                 {
10                     case DialogResult.Cancel:
11                         this.textBox1.Text = "你输入有误";
12                         break;
13                     case DialogResult.OK:
14                         this.textBox1.Text = "";
15                         break;
16                     default:
17                         break;
18                 }
19             }
20         }