I successfully created report using report model in BIDS 2008 and after deployment I created report using Report builder 1.0 designer but while running report it asked me for userid and pwd and which credentials were to be
used in that gor confused..
and it also gave following error
Report execution error:
The ConnectionString property has not been initialized.
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Cannot create a connection to data source 'dataSource1'.
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An error has occurred during report processing.