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Home/ Questions/Q 7603041
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Editorial Team
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Editorial Team
Asked: May 30, 20262026-05-30T23:34:03+00:00 2026-05-30T23:34:03+00:00

When i open form, i can’t get into design mode and i get this

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When i open form, i can’t get into design mode and i get this error:

The variable 'MonthViewCalendar'
    (internal 
        Infragistics.Win.UltraWinSchedule.UltraMonthViewSingle 
        MonthViewCalendar;)
is either undeclared or was never assigned. 

Any idea why a form doesn’t go into design mode? I am using VS 2010.

I tried – Clean solution, restarting VS and reopening, but that didn’t solve my issue.

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  1. Editorial Team
    Editorial Team
    2026-05-30T23:34:05+00:00Added an answer on May 30, 2026 at 11:34 pm

    Go into your Form.Designer.cs file and remove the declaration for “abcd”. Then reload it in your designer.

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