[ISS Support Case] Migrated Historian Client Trend Throws .NET Error

Last updated: October 17th, 2025

Description

I open the trend window, see trendlines, etc. all is ok. I log in as part of the on show script so its always logged in once the window opens. System.InvalidOperationException: Cannot set the SelectedValue in a ListControl with an empty ValueMember. at System.Windows.Forms.ListControl.set_SelectedValue(Object value)

Author: Kevin Modlin
Published: October 17th, 2025

Details:

Product: InTouch

Version: 2020 R2

Solution: [Solution is visible below when you're logged in and have a current subscription]

Date Created:	02/02/2022
Case:	80878

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