private void Button1_Click(object sender, EventArgs e) { try { var UserName = textBox3.Text; var UserPwd = textBox2.Text; var Name = textBox1.Text; if (string.IsNullOrEmpty(UserName) || string.IsNullOrEmpty(UserPwd) || string.IsNullOrEmpty(Name)) { MessageBox.Show("必须都要填写"); return; } int flag = DbTools.AddUser(UserName, UserPwd, Name); if (flag != 1) { MessageBox.Show("注册失败"); textBox3.Text = ""; textBox2.Text = ""; textBox1.Text = ""; } else { MessageBox.Show("注册成功"); textBox3.Text = ""; textBox2.Text = ""; textBox1.Text = ""; } } catch (Exception exce) { string ExcepStr = exce.ToString(); if (ExcepStr.IndexOf("重复") != -1) { MessageBox.Show("用户名已经有人抢占拉"); } } }