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Editorial Team
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Asked: 2026-06-16T11:00:44+00:00

I’m using Entity Framework in asp.net in Visual Studio 2012. I’m just learning these

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I’m using Entity Framework in asp.net in Visual Studio 2012. I’m just learning these stuffs. I followed this tutorial

Just created the grid and I run the web site, everything is fine except the delete operation. When I click delete it shows me an error like this:

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Would somebody tell me why I’m getting this error and how to rectify this. . .

Thanks in advance

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1 Answer

  1. Editorial Team

    Your answer for your question is given in your tutorial. (Applicable only if you are using the same tables and same constraints)
    under “Revising EntityDataSource Control Markup to Improve Performance“

    The Delete button also works. Click delete for a row that has an enrollment date and the row disappears. (Rows without an enrollment date represent instructors and you may get a referential integrity error. In the next tutorial you’ll filter this list to include just students.)

    You are getting referential error means you haven’t used cascade in delete operation so when you delete a row in person table,as the same column is referenced in student grade table. so delete won’t take place. use cascade – ON DELETE CASCADE.

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