change id of a server control in asp.net

Question

Hai guys,

I used find control to find a list item of an unoreder list inside a master page from content page using this,

Control home = this.Page.Master.FindControl("list").FindControl("home");

Now i have to change the id of the control home to "current" because to apply css for it....

Answer 1

Do you know the Type of the control you're finding? Neither Control nor ListItem expose a CssClass property, however, ListItem does expose it's Attributes property.

Update based on comment and other question:

You should be using System.Web.UI.HtmlControls.HtmlGenericControl

So something like this should work for you:

HtmlGenericControl home = 
                    this.Page.Master.FindControl("list").FindControl("home")
                                                         as HtmlGenericControl;

string cssToApply = "active_navigation";

if (null != home) {
  home.Attributes.Add("class", cssToApply);
}

If you think there might already be an class assigned to it that you need to append to you could do something like:

if (null != home) {
  if (home.Attributes.ContainsKey("class")) {
    if (!home.Attributes["class"].Contains(cssToApply)){
      // If there's already a class attribute, and it doesn't already
      // contain the class we want to add:
      home.Attributes["class"] += " " + cssToApply;
    }
  }
  else {
    // Just add the new class
    home.Attributes.Add("class", cssToApply);
  }
}

If they aren't ListItems, cast them to the correct type, and modify the attributes collection as before, unless there's a CssClass property for that type.