{"id":548,"date":"2003-12-19T08:06:31","date_gmt":"2003-12-19T12:06:31","guid":{"rendered":"http:\/\/wordpress.cephas.net\/?p=548"},"modified":"2003-12-19T08:06:31","modified_gmt":"2003-12-19T12:06:31","slug":"accessing-aspnet-dropdownlist-items-from-code-behind","status":"publish","type":"post","link":"https:\/\/cephas.net\/blog\/2003\/12\/19\/accessing-aspnet-dropdownlist-items-from-code-behind\/","title":{"rendered":"Accessing ASP.NET DropDownList Items from Code behind"},"content":{"rendered":"

Couple days ago I was writing an ASP.NET webform and I wanted to programmatically inspect the items in the drop down<\/a>. The drop down list in the ASP.NET page looks something like this:
\n
\n<asp:dropdownlist id=\"mydropdown\" class=\"dropbox\" runat=\"server\">
\n  <asp:listitem text=\" -- select -- \" value=\"\" \/>
\n  <asp:listitem text=\"Text 1\" value=\"1\" \/>
\n  <asp:listitem text=\"Text 2\" value=\"2\" \/>
\n  <asp:listitem text=\"Text 3\" value=\"3\" \/>
\n<\/asp:dropdownlist>
\n<\/code>
\nand then in the code behind (like I mentioned before<\/a>) you can do a bunch of useful things. First, if I wanted to set the default selected item in the form, I’d write this:
\n
\npublic void Page_Load(Object sender, EventArgs e) {
\n  \/\/ initialize form
\n  if (!IsPostBack) {
\n   mydropdown.SelectedValue = \"1\";
\n  }
\n}
\n<\/code>
\nThat’s relatively trivial, it gets more interesting when you consider that you can access the DropDownList items<\/a> programatically:
\n
\nforeach (ListItem l in mydropdown.Items) {
\n  if (l.Value == 1) {
\n   l.Selected = true;
\n  }
\n}
\n<\/code>
\nIn the above example I use the foreach<\/a> statement to iterate through the collection of ListItems in the Items property. If the Value property<\/a> of the ListItem is 1, then I set that to be selected. You can also access the Text property<\/a> of the List Item.<\/p>\n

The C# foreach construct jogged my memory about Java 1.5 (Tiger) which is supposed to have enhanced ‘for’ loops<\/a> (also read this<\/a>); for example this:
\n
\nfor (Iterator i = c.iterator(); i.hasNext(); ) {
\n  \/\/ do stuff with 'i'
\n}
\n<\/code>
\nbecomes this:
\n
\nfor (Object o : c) {
\n  \/\/ do stuff w\/ 'o'
\n}
\n<\/code>
\nWhen is 1.5 gonna arrive?<\/p>\n","protected":false},"excerpt":{"rendered":"

Couple days ago I was writing an ASP.NET webform and I wanted to programmatically inspect the items in the drop down. The drop down list in the ASP.NET page looks something like this: <asp:dropdownlist id=”mydropdown” class=”dropbox” runat=”server”>   <asp:listitem text=” — select — ” value=”” \/>   <asp:listitem text=”Text 1″ value=”1″ \/>   <asp:listitem text=”Text 2″ value=”2″ \/> … Continue reading Accessing ASP.NET DropDownList Items from Code behind<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[17],"tags":[],"_links":{"self":[{"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/posts\/548"}],"collection":[{"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/comments?post=548"}],"version-history":[{"count":0,"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/posts\/548\/revisions"}],"wp:attachment":[{"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/media?parent=548"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/categories?post=548"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/tags?post=548"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}