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knowledge-base/cannot-convert-to-telerik-reportviewer-html5-webforms-reportsource.md

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+---
+title: Cannot implicitly convert type Telerik.Reporting.XXXReportSource to Telerik.ReportViewer.Html5.WebForms.ReportSource
+description: When using HTML5 WebForms viewer there is an error Cannot implicitly convert type Telerik.Reporting.XXXReportSource to Telerik.ReportViewer.Html5.WebForms.ReportSource
+type: troubleshooting
+page_title: Cannot implicitly convert type Telerik.Reporting.XXXReportSource to Telerik.ReportViewer.Html5.WebForms.ReportSource when using HTML5 WebForms report viewer
+slug: cannot-convert-to-telerik-reportviewer-html5-webforms-reportsource
+position: 
+tags: reportsource,html5webformsviewer
+ticketid:
+res_type: kb
+---
+
+## Environment
+<table>
+	<tr>
+		<td>Product</td>
+		<td>Progress® Telerik® Reporting</td>
+	</tr>
+</table>
+
+
+## Description
+Cannot implicitly convert type 'Telerik.Reporting.XXXReportSource' to 'Telerik.ReportViewer.Html5.WebForms.ReportSource' error when setting the ReportSource of the HTML5 WebForms Report Viewer.
+
+## Solution
+[HTML5 WebForms Report Viewer](https://docs.telerik.com/reporting/webforms-report-viewer-controls-overview) works with a client-side report source which is of type **Telerik.ReportViewer.Html5.WebForms.ReportSource**. 
+
+*ReportSource.IdentifierType* property specifies which [resolver](https://docs.telerik.com/reporting/telerik-reporting-rest-service-report-resolver#overview) will be used for resolving the report description string on the server.
+
+*ReportSource.Identifier* property accepts a string that contains information about the report. This string can be a path to a TRDP or TRDX file that can be resolved by [ReportFileResolver](https://docs.telerik.com/reporting/t-telerik-reporting-services-webapi-reportfileresolver), an assembly-qualified name of the report class which can be resolved by [ReportTypeResolver](https://docs.telerik.com/reporting/t-telerik-reporting-services-webapi-reporttyperesolver) or custom information which can be resolved by [custom report resolver](https://docs.telerik.com/reporting/telerik-reporting-rest-service-report-resolver#custom-report-resolver-implementations).
+
+Examples of setting the ReportSource of HTML5 WebForms Report Viewer:
+
+*C#*
+```c#
+protected void Page_Load(object sender, EventArgs e)
+        {
+            if (!IsPostBack)
+            {
+                Telerik.ReportViewer.Html5.WebForms.ReportSource reportSource = new Telerik.ReportViewer.Html5.WebForms.ReportSource();
+                reportSource.IdentifierType = Telerik.ReportViewer.Html5.WebForms.IdentifierType.UriReportSource;
+                reportSource.Identifier = "Report1.trdp";            
+                reportViewer1.ReportSource = reportSource;
+            }
+        }
+```
+
+*VB*
+```vb
+Protected Sub Page_Load(sender As Object, e As EventArgs)
+    If Not IsPostBack Then
+        Dim reportSource As New Telerik.ReportViewer.Html5.WebForms.ReportSource()
+        reportSource.IdentifierType = Telerik.ReportViewer.Html5.WebForms.IdentifierType.UriReportSource
+        reportSource.Identifier = "Report1.trdp"
+        reportViewer1.ReportSource = reportSource
+    End If
+End Sub
+```
+
+## See Also
+[How to: Set ReportSource for Report Viewers](https://docs.telerik.com/reporting/report-sources-viewers)
+
+[How to display a report via InstanceReportSource in the HTML5 Viewer](https://www.telerik.com/support/kb/reporting/details/how-to-display-a-report-via-instancereportsource-in-the-html5-viewer)