如何将数据从功能发送到Web表单中的HTML页面列表

Question

I have a Application I neaver work on Web Form so simple I have to send a data to html page..

in the First page I have a Button and a listBox

<asp:Button ID="Button12" runat="server" Text="Button" OnClick="Button12_Click" />
<asp:ListBox ID="ListBox1" runat="server"></asp:ListBox>

So when I click the button it should send list of user to the list box

protected void Button12_Click(object sender, EventArgs e)
{
    ApplicationDbContext obk = new ApplicationDbContext();
    foreach (var item in obk.Users.ToList())
    {
        ListBox1.Text = item.UserName;

    }

First it is not showing the data in the list box

second I want to send a data from C# to Html like in MVC we have ViewData["jsad"] so is there any thing in Web Form I am new in Web Forms I work on MVC so I am so confuse

And you can give me any good web link for tutorial for Web form ,

Answer 1

First you have to add ListItem to show item.UserName in your ListBox .

protected void Button12_Click(object sender, EventArgs e)
{
    ApplicationDbContext obk = new ApplicationDbContext();
    foreach (var item in obk.Users.ToList())
    {
        ListBox1.Items.Add(item.UserName);
    }
}

Secondly, I think Page.Items is very equivalent to ViewData . It's IDictionary so you can add and show the value of "jsad" like this.

aspx.cs:

protected void Page_Load(object sender, EventArgs e)
{
    Page.Items["jsad"] = "value";
    // or Page.Items.Add("jsad", "value");
}

aspx:

<div>jsad = <%: Page.Items["jsad"] %></div>

and here is a good reference for MVC developers to understand WebForms. http://www.codeproject.com/Articles/528117/WebForms-vs-MVC