Unable to update control in Master page from content page.

Could you please share your Marquee HTML with us?

Hi ,
     
   here is the marquee code in master page.
  <div>
 
        <marquee direction="left" id="maq1" runat="server" behavior="alternate" loop="true"
            scrollamount="2" align="center" onmouseover='this.stop()' onmouseout='this.start()'
            style="width: 917px; height: 20px"> 
                     
              </marquee>
          
        
    </div>

thanks.

The following works for me

 (this.Master.FindControl("maq1") as HtmlGenericControl).InnerHtml = "Hello";

well, but it does not work for me.thanks for assistance.

Then it is also set somewhere else. Make sure you are not doing such thing