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One of the most important features provided by Rad Grid View is the data validation.Data validation features enable you to take complete control of the data entered in your grid's cells. This is the validation that is built into the business object implementation.In this walkthrough, you will retrieve rows from the column and tries to leave the cell, the Cell Validating event handler will examine new company name string to make sure it is not empty; if the new value is an empty string, the Data Grid View will prevent the user's cursor from leaving the cell until a non-empty string is entered.To copy the code in this topic as a single listing, see How to: Validate Data in the Windows Forms Data Grid View Control.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.Rad Grid View exposes a property - Validates On Data Errors - that controls the way the data validation, provided by IData Error Info and INotify Data Error Info Interfaces, is performed. Length When you try to enter an order number that has fewer than five characters, you should see a validation message that is similar to the one in Figure 2. Is Valid property to False, this will cancel the editing process and will return focus to the invalid Grid View Cell. In this case, you need to throw an exception when an incorrect value is about to be set.

I have some code in the Row Validating event that works well to ensure that required values are present and not too long, etc.What I need to do is prevent the user from entering a record that already exists.I tried having my insert procedure do the check and then pass back a message indicating that the record already exists. However, the problem is that duplicate record that the user just entered remains in the grid. Row Index) However, I get an error saying that this operation is not allowed in the Row Validated event.It is a Flags Enumeration and can take the following values: The cell validation occurs when a Grid View Cell is edited and its new data is about to be committed. You can do the same thing per row, using the Row Validating event. Length Figure 4 shows the result from a failed validation.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.

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