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Editorial Team
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Asked: 2026-05-31T00:13:09+00:00

I have masterpage which has runat=server & Id set on body tag. see below

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I have masterpage which has runat=”server” & Id set on body tag. see below

<body id="MasterPageBodyTag" runat="server">

code behind on masterpage I’ve added the following code:

    public HtmlGenericControl BodyTag
{
    get { return MasterPageBodyTag; }
    set { MasterPageBodyTag = value; }
}

now I want to add css class to body tag from Class1.cs file in App_code folder.

On the .aspx am passing the master page control using the following code:

  protected void Page_Load(object sender, EventArgs e)
{
    backend.FindPage((PageTemp)this.Master);

}

Now on Class1.cs I have the following

  public static void FindPage(Control mp)
{

    Page pg = (Page)HttpContext.Current.Handler;


    PropertyInfo inf = mp.GetType().GetProperty("BodyTag");

}

I want to add the following to found BodyTag

 //      BodyTag.Attributes.Add("class", "NewStyle");

But can’t seem to find a way to add atrribute or cast the inf to HtmlGenericControl.

Any help would be great.

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1 Answer

  1. Editorial Team

    Rather than having a dependency on the Master Page type, I’d simply use FindControl to search for the body element by Id. Assuming the body tag is on your top-level Master page, and also assuming you may be using nested master pages, it would look something like:

    private static MasterPage GetTopLevelMasterPage(Page page)
{
    MasterPage result = page.Master;
    if (page.Master == null) return null;

    while(result.Master != null)
    {
        result = result.Master;
    }

    return result;
}

private static HtmlGenericControl FindBody(Page page)
{
    MasterPage masterPage = GetTopLevelMasterPage(page);
    if (masterPage == null) return null;
    return masterPage.FindControl("MasterPageBodyTag") as HtmlGenericControl;
}

private void UpdateBodyCss()
{
    HtmlGenericControl body = FindBody(this);
    if(body != null) body.Attributes.Add(...);
}

    You could even remove the dependency on the id by searching for an HtmlGeneric control with a tag name of “body”:

    private static HtmlGenericControl FindBody(Page page)
{
    MasterPage masterPage = GetTopLevelMasterPage(page);
    if (masterPage == null) return null;
    foreach(Control c in masterPage.Controls)
    {
        HtmlGenericControl g = c as HtmlGenericControl;
        if (g == null) continue;
        if (g.TagName.Equals("body", StringComparison.OrdinalIgnoreCase)) return g;
    }
    return null;
}
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