If I erase my "Row Validating" and try again, the problem is solved.
The purpose of this tutorial is to show you how to validate data using Rad Grid View. An alternative approach is to use validation on a property level as shown in Example 4.
Attach to the Cell Validating event, which is exposed by the Rad Grid View. Example 5 shows how to validate the Order NO and Total properties of the Order object. Rad Grid View also allows you to take advantage of the System. Public Property Order NO() As String Get Return Me.m_order No End Get Set(By Val value As String) Dim validation Context As New Validation Context(Me, Nothing, Nothing) validation Context. Validate Property(value, validation Context) Me.m_order No = value End Set End Property Once the UI and Data validation is passed (i.e., the Binding tried to update the value for the bound property), the Cell Validated event is raised. Here you can also add a custom logic like changing the visual state of the editor (through the e. For a general example on how to validate the data, you can check our Validation online demos.
Private Sub rad Grid View_Cell Validating(By Val sender As Object, By Val e As Telerik. Attach to the Row Validating event, which is exposed by the Rad Grid View. Grid View Row Validating Event Args) Dim order As Order = Try Cast(e. You can also download runnable projects from our online SDK repository here; the examples are listed under Grid View.
At this moment, a Cell Validating event is fired and since the new value is not committed yet to the underlying data object, here is the perfect place for applying a custom UI validation. The Row Validating event is very similar to the Cell Validating event. Once you have added such errors, you will have to explicitly clear them when needed.
Example 3 shows how to validate the Order No property of the Order object to be longer than 5 characters. However, instead of getting an individual cell, you are getting an entire row. Please check this help article for information about how to clear user defined errors. Example 7 shows you how to use Data Annotations in order to validate the Order NO property of the Order object.
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Sf Data Grid will not allow to edit other cell / row if validation failed.