VS中关于注册功能的实现有点小问题

Question

求问各位，看看我的注册代码哪里出问题了，用户名和密码都可以判断成功，就是写不进数据库里，要怎么修改 protected void btnRegister_Click(object sender, EventArgs e)
{
//判断是否已存在用户
string strUser = tbusername.Text.Trim();
string strPsw = tbpsw.Text.Trim();
string strSql = string.Format("select * from tbUser where name='{0}'", strUser);

        string connStr = ConfigurationManager.ConnectionStrings["dbconn"].ConnectionString;
        SqlConnection sqlConn = new SqlConnection();
        sqlConn.ConnectionString = connStr;
        sqlConn.Open();
        SqlCommand cmd = new SqlCommand(strSql, sqlConn);
        cmd.CommandType = CommandType.Text;
        SqlDataReader sdr =cmd .ExecuteReader();
        sdr.Read ();

        DataTable dtUser = new DataTable();//执行SQL语句，并返回执行结果，转载到DataTable中   
        if (sdr.HasRows)
             {
                 Response.Write(@"<script>alert('用户已存在，请重新输入');</script>");
             }     
        else  
           {
               //判断用户两次输入的密码是否一致            
                 if (this.tbpsw.Text == this.tbpsw1.Text && this.tbpsw.Text != null)
              {
               sdr.Close();
               string sql = string.Format("insert into tbUser（name,password）values ('" + tbusername.Text + "','" + tbpsw.Text + "')");
               SqlCommand mycom  = new SqlCommand(strSql, sqlConn);
               mycom .ExecuteNonQuery();
               sqlConn.Close();
               sqlConn.Dispose();
               Session["user"] = strUser; 
               Response .Write(@"<script>alert('注册成功！');</script>");
               Response.Redirect("~/loading.aspx");
              }
                 else
              {
               Response.Write(@"<script>alert('请确认两次输入密码一致！');</script>");
               tbusername.Text = tbpsw.Text = string.Empty; 
               }
            }




    }

Answer 1

 string sql = string.Format("insert into tbUser（name,password）values ('" + tbusername.Text + "','" + tbpsw.Text + "')");

这行代码中包含 name,password 的括号不是英文状态的括号，是全角字符。
注意

 （ 和 (

的区别