注册应该怎么写啊

汗。。。就是添加數據庫了

無語了。。

還是多看看書吧

連接數據庫

用Insert語句

（Button2注冊）
先讀取數據庫

判斷是否存在相同的用戶名

如果沒有 Insert

注冊成功

如果有相同的

注冊失敗 重新注冊

我實在想不出代碼有什麽難寫的。。。

楼上你
我也会说
可是代码不会写啊

无语

public string connstr = System.Configuration.ConfigurationSettings.AppSettings["dsn"];

 private void btnIn_Click(object sender, EventArgs e)
        {
            strError = "";
            if (this.txtName.Text == "" || this.txtPwd.Text == "")
            {
                MessageBox.Show("输入不能为空！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else if (this.txtName.Text != "" && this.txtPwd.Text != "")
            {
                if (this.txtName.Text.Length > 10)
                {
                    strError += "用户名输入字符数应小于10位！" + "\r";
                }
                if (this.txtPwd.Text.Length > 10)
                {
                    strError += "密码输入字符数应小于10位！" + "\r";
                }
                if (strError != "")
                {
                    MessageBox.Show(strError.ToString(), "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                else
                {
                    try
                    {
                        SqlConnection conn = new SqlConnection(connstr);
                        if (conn.State == ConnectionState.Closed)
                        {
                            try
                            {
                                conn.Open();
                            }
                            catch (Exception)
                            {
                                MessageBox.Show("请检查数据库数否连接！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                            }
                        }
                        string sql = "select * from UserIn where UserName = '" + this.txtName.Text.Trim() + "'";
                        SqlCommand cmd = new SqlCommand(sql, conn);
                        SqlDataReader reader = cmd.ExecuteReader();
                        if (reader.Read())
                        {
                             MessageBox.Show("已存在此用户！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);

                            conn.Close();
                        }
                        else
                        {
                             string addstr = "insert into UserIn(UserName,PassWord) values('" +this.txtName.Text.Trim() + "','" + this.txtPassWord.Text.Trim() + "')";
                            SqlCommand sqlcom = new SqlCommand(addstr, conn);
                            try
                            {
                             sqlcom.ExecuteNonQuery();
                             MessageBox.Show("注册成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                             }
                              catch (Exception)
                              {
                                MessageBox.Show("注册失败！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                                conn.Close();
                              }
                        }
                        conn.Close();
                    }
                    catch
                    {
                        
                    }
                }
            }
        }

[[it] 本帖最后由 谁与争瘋 于 2008-11-18 16:34 编辑 [/it]]

...

建议LZ还是多看些书吧

书上写的很详细的

哎。。。

if (reader.Read())
                        {
                             MessageBox.Show("已存在此用户！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);

                            conn.Close();
                        }

为什么我打reader。不出read啊

我现在的电脑上没有安装VS 这全是我手动打的

按照印象  应该有Read（）的啊

reader.*****

后面没有？？？

你再看看