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Server cannot append header after HTTP headers have been sent.

Server Error in '/' Application.

Server cannot append header after HTTP headers have been sent.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Server cannot append header after HTTP headers have been sent.

Source Error: 


Line 750:
Line 751:                if (!String.IsNullOrEmpty(this.HstsHeader))
Line 752:                    Response.AddHeader("Strict-Transport-Security", this.HstsHeader);
Line 753:
Line 754:                if (FormState.Groups != null)

Source File: D:\Centralpoint\WebSites\cpweb_QualityControl\Root\App_Code\Page.cs    Line: 752

Stack Trace: 


[HttpException (0x80004005): Server cannot append header after HTTP headers have been sent.]
   System.Web.HttpResponse.AppendHeader(String name, String value) +231
   Centralpoint.WebSite.Page.Render(HtmlTextWriter writer) in D:\Centralpoint\WebSites\cpweb_QualityControl\Root\App_Code\Page.cs:752
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +80
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4563

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.9318.0