The type 'ReportErrorEventArgs' exists in both 'Microsoft.ReportViewer.WebForms' and 'ReportingServicesWebServer'

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fapw

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My first purpose to handle with Microsoft Reporting Service error and output custom message with help of ReportErrorEventHandler. See more on msdn about ReportErrorEventHandler.
To test it I have created ASP.net Empty Web Site in Visual Studio 2017 (.NET Framework 4.6.1). Added masterpage ReportViewer.aspx, code behind page ReportViewer.aspx.cs, config file Web.Config. Registered two assemblies ReportingServicesWebServer and Microsoft.ReportViewer.WebForms


<%@ Register assembly="ReportingServicesWebServer, Version=13.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" Namespace="Microsoft.ReportingServices.WebServer" TagPrefix="RS"%>
<%@ Register assembly="Microsoft.ReportViewer.WebForms, Version=14.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" namespace="Microsoft.Reporting.WebForms" tagprefix="rsweb" %>

because default Microsoft Reporting Services page contains RS:ReportViewerHost user control which requires ReportingServicesWebServer assembly, and ReportErrorEventHandler requires Microsoft.ReportViewer.WebForms according to msdn article mentioned above.

As a result a get an error

The type 'ReportErrorEventArgs' exists in both 'Microsoft.ReportViewer.WebForms, Version=14.0.0.0, Culture=neutral,
PublicKeyToken=89845dcd8080cc91' and 'ReportingServicesWebServer, Version=13.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91'
ReportViewer.aspx.cs

When I'm trying to use namespace Microsoft.ReportingServices.WebServer instead of Microsoft.Reporting.WebForms, it tells me

The type or namespace name 'ReportErrorEventArgs' could not be found (are you missing a using directive or an assembly reference?) ReportViewer.aspx.cs

Also I didn't find how to use alias for references to use specific assembly, because there is noreference section in my solution explorer.

How could I hold both assemblies and get rid of an error. Thanks in advance!

ReportViewer.aspx.cs code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Microsoft.Reporting.WebForms
{
public partial class ReportViewer1 : System.Web.UI.Page
{
public void ReportErrorEventHandler(object sender, ReportErrorEventArgs e)
{
Exception ex = e.Exception;
ReportErrorMessage.Text = ex.Message;
while (ex.InnerException != null)
{
ex = ex.InnerException;
ReportErrorMessage.Text = ReportErrorMessage.Text + ex.Message;
}
ReportErrorMessage.Visible = true;
if (ReportErrorMessage.Text.Contains("rsErrorOpeningConnection"))
{
ReportErrorMessage.Text = "The database is under everyday maintanence now. Please try again in 20 minutes.";
}
e.Handled = true;
}
}
}

ReportViewer.aspx code:

<%@ Register assembly="ReportingServicesWebServer, Version=13.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" Namespace="Microsoft.ReportingServices.WebServer" TagPrefix="RS"%>
<%@ Register assembly="Microsoft.ReportViewer.WebForms, Version=14.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" namespace="Microsoft.Reporting.WebForms" tagprefix="rsweb" %>
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ReportViewer.aspx.cs" Inherits="Microsoft.Reporting.WebForms.ReportViewer1" EnableEventValidation="false" %>

<!DOCTYPE html>

<script runat="server">

</script>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<form id="ReportViewerForm" runat="server">
<asp:scriptmanager runat="server"></asp:scriptmanager>
<asp:label runat="server" id="ReportErrorMessage" Visible="false"></asp:label>
<table cellspacing="0" cellpadding="0" width="100%" height="100%"><tr height="100%"><td width="100%">
<rsweb:ReportViewer ID="ReportViewerControl" runat="server" ProcessingMode="Remote" Height="100%" Width="100%" OnReportError="ReportErrorEventHandler">
<ServerReport ReportPath="<ReportPath>" ReportServerUrl="<URL>" />
</rsweb:ReportViewer>
</td></tr></table>
</form>
</body>
</html>

Note that ReportViewer.aspx does not contains RS:ReportViewerHost user control, but contains rsweb:ReportViewer, because it is test project. And if remove ReportingServicesWebServerassembly it will work as expected. But production web page requires both assemblies, ReportingServicesWebServer for RS:ReportViewerHost user control and Microsoft.ReportViewer.WebForms to use ReportErrorEventHandler.

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