ASP.NET Crystal Reports image field not showing - asp.net

Question

I am using VS-2008 for asp.net web application. However, I have developed my reports in VS 2005. ( I am reusing some reports that were developed in other project).
The reports work fine except the image field is not displayed. The image field is a 'VARBINARY(MAX)' field in database. Note that when I export my Crystal Report to .pdf the images shows up in the .pdf file.
(* I am able to see an image url in 'Firebug' but getting message 'Load Image failed')
I am using a 'TypedDataset' as DataSource for the Crystal Report.
I fetch the data from database and do a 'DataSet.WriteXML(filename,WriteMode.WriteSchema)'
Here is the code:-
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim rgx As Regex = New Regex("[^a-zA-Z0-9 -]")
strComp = rgx.Replace(strComp, "")
strFile = "tempXML" + strComp + ".xml"
Dim dsTemp As New DataSet
dsTemp.Clear()
dsTemp.Tables.Clear()
Dim rptengine As New CrystalDecisions.CrystalReports.Engine.ReportDocument
rptengine.Load(Session("rptname"))
sdate = CType(Session("sdate"), Date)
edate = CType(Session("edate"), Date)
rptHeading = Session("rptHead")
If IO.File.Exists(Server.MapPath("~/" + strFile)) Then
dsTemp.ReadXml(Server.MapPath("~/" + strFile), XmlReadMode.ReadSchema)
'IO.File.Delete(Server.MapPath("~/" + strFile))
Try
If Session("rptname").ToString.Substring(Session("rptname").ToString.LastIndexOf("\") + 1) _
= "Rptemp.rpt" Then
Dim dsReport As New DDL.dsEmpList
dsReport.Tables("dtEmpList").Merge(dsTemp.Tables(0))
rptengine.SetDataSource(dsReport.Tables(0))
ElseIf Session("rptname").ToString.Substring(Session("rptname").ToString.LastIndexOf("\") + 1) _
= "rptDailyAttendance.rpt" Then
Dim dsReport As New DDL.dsDailyReoprt
dsReport.Tables("dtDailyReport").Merge(dsTemp.Tables(0))
rptengine.SetDataSource(dsReport.Tables(0))
End If
Catch ex As Exception
ShowMsg1("Exception : " & ex.Message)
End Try
'**********************assigning CR-ParameterFields*****************************
Dim crParameterFieldDefinitions As ParameterFieldDefinitions
Dim crParameterFieldDefinition As ParameterFieldDefinition
Dim crParameterValues As ParameterValues
Dim crParameterDiscreteValue As ParameterDiscreteValue
Dim parameterToDefine As Boolean = False
crParameterFieldDefinitions = rptengine.DataDefinition.ParameterFields
For Each crParameterFieldDefinition In crParameterFieldDefinitions
crParameterDiscreteValue = New ParameterDiscreteValue
crParameterValues = crParameterFieldDefinition.CurrentValues
Select Case crParameterFieldDefinition.Name
Case "sdate"
parameterToDefine = True
crParameterDiscreteValue.Value = sdate
Case "edate"
parameterToDefine = True
crParameterDiscreteValue.Value = edate
Case "heading"
parameterToDefine = True
crParameterDiscreteValue.Value = rptHeading
Case Else
parameterToDefine = False
End Select
If parameterToDefine Then
Try
crParameterValues.Add(crParameterDiscreteValue)
crParameterFieldDefinition.ApplyCurrentValues(crParameterValues)
Catch ex As Exception
objdata.writelog(ex.Message, "frmRptEngine", "frmRptEngine_Load", Server.MapPath("~/Reports"))
ShowMsg1("Error in report generation.")
Exit Sub
End Try
End If
Next
rptViewer.ReportSource = Nothing
rptViewer.ReportSource = rptengine
rptViewer.Enabled = True
rptViewer.DataBind()
Else
ShowMsg1("Invalid attempt.")
End If
End Sub

Answer 1

For those of us running migrated projects from .Net 4.0 or lower to 4.5+ I have made an observation. It seems if your page that contains the viewer is in a subdirectory then the image urls are being generated relative to that page and not to the root of the web application. E.g if your page is /gl/accounts.aspx then the image may be /gl/crystalimagehandler.aspx etc
A quick way to fix this is to change your handler mapping to a wildcard ending in crystalimagehandler.aspx or put the following code in Global.asax
protected void Application_BeginRequest(object sender, EventArgs e)
{
var p = Request.Path.ToLower().Trim();
if (p.EndsWith("/crystalimagehandler.aspx") && p!= "/crystalimagehandler.aspx")
{
var fullPath=Request.Url.AbsoluteUri.ToLower();
var index = fullPath.IndexOf("/crystalimagehandler.aspx");
Response.Redirect(fullPath.Substring(index));
}
}