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ConnectionString Report Parameter and Binding

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Curt Rabon
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Curt Rabon asked on 09 May 2020, 01:53 PM

I need to dynamically provide a ConnectionString to a .trdp at runtime.
I've tried to use a parameter and a binding as stated here: https://docs.telerik.com/reporting/knowledge-base/how-to-pass-connectionstring-to-report-dynamically-through-report-parameter
but I can't get it to work. Without the parameter and binding, the existing dataSource works fine in preview. I'm using Standalone Report Designer 13.2.19.1213. When I add the parameter and binding, and put the connection string value in the parameter input box during preview, I get an error. See the attached picture that shows all settings.

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Neli
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answered on 13 May 2020, 06:38 AM

Hello Curt,

I have already answered the same questions in Binding "DataSource" Property forum post.

Regards,
Neli
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Curt Rabon
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answered on 13 May 2020, 02:31 PM

After looking carefully at https://docs.telerik.com/reporting/expressions-bindings, I noticed that I did not start the binding's expression value with an equal sign, so instead of =Parameters.ConnectionStringParam.Value, I only had Parameters.ConnectionString.Value. I fell into this trap because your page at https://docs.telerik.com/reporting/knowledge-base/how-to-pass-connectionstring-to-report-dynamically-through-report-parameter does not show the equal sign in your example. I suggest showing the equal sign or reminding people that it's needed.

After using the equal sign, the report parameter works fine, and I can dynamically switch the connection string.

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Remco
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answered on 21 Oct 2020, 04:53 AM
Thanks for your suggestion to prefix the binding with an equal sign, that solved my problem too. Unfortunately after 5 months this Telerik documentation post is still not updated. 
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Latha
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answered on 22 Sep 2022, 03:30 PM

i get the same error

Neli
Telerik team
commented on 27 Sep 2022, 09:15 AM

Hi Latha,

I noticed that a similar problem is discussed in the Missing operand before '=' operator forum thread. I would recommend sending me the problematic application, so I can inspect it on my end.

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Curt Rabon
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