I'm using Telerik Reporting Tools version 220.127.116.11 on Visual Studio 2017.
I converted a few of my report parameter data sources from Current Data Sources to Report Data Sources by creating a class as described here (these are data sources that'll be used across multiple reports):
I used the Wizard to create the data source and the query works within the Wizard, but once I try to open the report I get the "ConnectionString property has not been initialized" error message.
I've verified the connection string is present in the app.config and I was using the same connection string within the Current Data Sources.
public partial class ExchangeDateDataSource : Telerik.Reporting.SqlDataSource
private void InitializeComponent()
this.ConnectionString = "Reports.Properties.Settings.IOConnection";
this.SelectCommand = "dbo.uspSelectExchangeRatesLkUp";
this.SelectCommandType = Telerik.Reporting.SqlDataSourceCommandType.StoredProcedure;
Anything I'm doing wrong? Thanks.