public int sqlEx(string cmdstr)
    {
        OleDbConnection conn = Getcon();  //连接数据库
        conn.Open();
        System.Web.HttpContext.Current.Response.Write(conn.State);
        OleDbCommand cmd = new OleDbCommand(cmdstr,conn);
        try
        {
            cmd.ExecuteNonQuery();
 
            return 1;
        }
        catch (Exception e)
       {
            return 0;
       }
        finally
        {
            conn.Dispose();

        }

    }

 protected void btnOk_Click(object sender, EventArgs e)
    {
        int reValue = CheckName();
        if (reValue == -1)
        {
            Response.Write("<script>alert('用户名存在！');</script>");
        }
        else
        {
            DB db = new DB();
            string UserName = this.txtUserName.Text;
            string PassWord = this.txtPwd.Text;
            string Email = this.txtEmail.Text;
            string cmdstr = "insert into tb_User(UserName,PassWord,Email) values('" + UserName + "','" + PassWord + "','" + Email + "')";
            try
            {
                reValue = db.sqlEx(cmdstr);

                if (reValue == 1)
                {
                    Response.Write("<script>alert('注册成功！');</script>");
                }
                else if(reValue==0)
                {
                    Response.Write("<script>alert('注册失败1！');</script>");
                }
            }
            catch(Exception ee)
            {
                Response.Write("<script>alert('注册失败！');</script>");
            }
        }
    }
在执行过程中，System.Web.HttpContext.Current.Response.Write(conn.State);能够输出open，说明数据库已经打开并建立连接。但是在sqlEx函数调用的过程执行cmd.ExecuteNonQuery()时，只会返回0不能将数据插入数据库中，我的数据库是access。