file.aspx.cs

protected void Page_PreRender(object sender, EventArgs e)
    {
        int temp = Convert.ToInt32(leftnav.Count);
        if (count == 0 && Convert.ToInt32(leftnav.Count) == 0)
        {
            contentright.Attributes["class"] = "center-part";


        }
        else if (count == 0 && Convert.ToInt32(leftnav.Count) != 0)
        {

            //contentright.Attributes["class"] = "content-right-part";
            contentright.Attributes["class"] = "center-part";
        }
        else if (count != 0 && Convert.ToInt32(leftnav.Count) == 0)
        {
            //contentright.Attributes["class"] = "content-Left-part";
            contentright.Attributes["class"] = "center-part";
        }
        else
        {

        }
    }