Use DataItem in Code-behind to set class or style in Nested Repeater

Question

I have looked around for awhile on this and I am not able to figure this out. I have a nested repeater that onItemDataBound event I would like to set class and style for some <DIV>.

HTML: <%# DataBinder.Eval(Container.DataItem,"sServer") %> >

CODE-BEHIND

 protected void rpDB_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        string _sql = "";
        using(SqlConnection _conn = new SqlConnection(_sql))
        {
            _conn.Open();
            DataTable _dt = new DataTable();
            // Get repeater controls
            Repeater rpDB_item = (Repeater)(e.Item.FindControl("rpDB_item"));
            SqlCommand _cmd = new SqlCommand("", _conn);
            SqlDataAdapter _da = new SqlDataAdapter(_cmd);
            _da.Fill(_dt);
            rpDB_item.DataSource = _dt;
            rpDB_item.DataBind();
        }

    }
}

protected void rpDB_item_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {

        if (<value of dataitem("online")> == "Online")
        {
            ((HtmlGenericControl)e.Item.FindControl("label2")).Attributes.Add("class", "glyphicon glyphicon-file");
            ((HtmlGenericControl)e.Item.FindControl("label2")).Attributes.Add("style", "color: green;");
            ((HtmlGenericControl)e.Item.FindControl("label2")).Attributes.Add("title", *<value of dataitem(sFile)>*);
        }
    }
}

Where I am stuck is in the code-behind I would like to use the value of one of the columns of the dataitem in some expressions, such as in the rpDB_item_ItemDataBound event above.

IE:

if (e.Item.DataItem("Online") == "Online")
{
   ((HtmlGenericControl)e.Item.FindControl("label2")).Attributes.Add("title", * e.Item.DataItem("sFile").ToString()*);
} 

Obviously something is wrong I am just sure where to go from here. Ideally I am either setting a class or a title of a label based on the dataitem value or the value itself.

Maybe there is a better way of doing this, such as creating the <div> in code behind, not really sure how to do that either? Any help or suggestions would be appreciated (NOVICE C#)

EDIT: I have added this function I think it is right

protected void FileExists(string url, RepeaterItemEventArgs e)
{
    Label myLabel = (Label)(e.Item.FindControl("divfile"));
    url = "@" + url;
    if (File.Exists(url))
    {
        myLabel.Attributes.Add("class", "green");
    }
    else { myLabel.Attributes.Add("class", "red"); }
}

and the following label

<div class='anj red glyphicon glyphicon-file <%= %> id="dvFile" runat="server" title=<%# DataBinder.Eval(Container.DataItem,"FileName") %>></div>

How would I call the function? I tried

<%# FileExists(DataBinder.Eval(Container.DataItem,"FileName")) %> 

inside the class but it is not sending the resulting string to the function.

Answer 1

protected void rpDB_item_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
        HtmlGenericControl dbOnline = ((HtmlGenericControl)e.Item.FindControl("dbOnline"));
        HtmlGenericControl sfile = ((HtmlGenericControl)e.Item.FindControl("lblfile"));
        //HtmlGenericControl online = ((HtmlGenericControl)e.Item.FindControl("dbOnline"));
        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
        {

            string sonline = (string)(DataBinder.Eval(e.Item.DataItem, "Online/Offline").ToString());
            string myfile = (string)(DataBinder.Eval(e.Item.DataItem,"FileName"));

            if (sonline == "Online")
            {
                sfile.Attributes.Add("class", "green");
                dbOnline.Attributes.Add("class", "led-green");
            }           
        }
    }

I added this and walked through it. Seems to be doing what is expected until the Attributes.Add section. It is not assigning the associated attributes. Again note that this is in a nested repeater if that makes a difference.