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It appears to need both as Add and Update use the "OnActionComplete" and Delete uses the "OnActionBegin"
It is really weird and counterintuitive. Also hard to find documentation on it.
BLBalamurugan Lakshmanan Syncfusion Team April 20, 2023 09:55 AM UTC
Greeting from Syncfusion Support.
reviewing your information, we have identified that the issue is due to the
missing definition of the GridEvents and PrimaryKeyColumn. We
would like to inform you that primary key is necessary to perform all the CRUD
operations. To define the primary key, set IsPrimaryKey to true in
a particular column whose value is unique. We modify the sample as per your
requirement. Kindly refer the attachment and UG documentation for your