Let the password not visible when enable 'RememberMe'

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C#

cookie

this is a 'remember me' login page . the html code is as below:

<div>
   <asp:TextBox ID="txtUserName" runat="server"></asp:TextBox>
</div>

<div>
   <asp:TextBox ID="txtPwd" TextMode="Password" runat="server"></asp:TextBox>
</div>

<div>
   <asp:CheckBox ID="cbRememberMe" runat="server" Text="Remember Me" />
   <asp:Button ID="btnLogin" runat="server" Text="Login" OnClick="btnLogin_Click" />
  <br />
  <asp:Label ID="lblMsg" runat="server" ForeColor="Red" Text=""></asp:Label>
</div>

as the title says , i enable the 'RememberMe' when i login the system in the login page, and add the login information into the cookies.

HttpCookie cookie = new HttpCookie("USER_COOKIE");
    if (this.cbRememberMe.Checked) {
        // 设置用户昵称、密码
        cookie.Values.Add("Name", txtUserName.Text);
        cookie.Values.Add("Pwd", txtPwd.Text);

        // 令 Cookie 永不过期                
        cookie.Expires = System.DateTime.Now.AddDays(7.0);
        // 保存用户的 Cookie
        HttpContext.Current.Response.Cookies.Add(cookie);
}

and then i bind the login information to the username textbox and the password textbox in the page_load event.

protected void Page_Load(object sender, EventArgs e) {
    // 非回发时执行如下程序
    if (!IsPostBack) {
        // 请求上次存储的Cookies
        HttpCookie cookies = Request.Cookies["USER_COOKIE"];
        // 如果此Cookies存在且它里面有子键则进行读取
        if (cookies != null && cookies.HasKeys) {
            txtUserName.Text = cookies["Name"];
            // 密码框赋值
            txtPwd.Attributes.Add("value", cookies["Pwd"]);
            // 并设置勾选记住密码
            this.cbRememberMe.Checked = true;
        }


    }
}

when I open the login page next time , then the values of the login name and password are both bind to the textbox controls .

Now the issue is :
when I open the login page next time , click the 'view source ' in the page with mouse right key , the password value shows in the textbox :

<div>
 input name="txtPwd" type="password" id="txtPwd" value="124212" />
</div>

'124212' is the login password with test .

as you know , this is not safe in web system .
i try to init the textbox value with a temporary value in the page_load ,as the code :

// 如果此Cookies存在且它里面有子键则进行读取
    if (cookies != null && cookies.HasKeys) {
        txtUserName.Text = cookies["Name"];
        // 密码框赋值
        txtPwd.Attributes.Add("value", "1234567890");
        // 并设置勾选记住密码
        this.cbRememberMe.Checked = true;
}

then i continue to user the cookie object in other pages.

does anybody know the better method to deal with this ? thanks!