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At run time, if the validation fails, the Data Grid View displays a red exclamation icon in that cell (see below).Hovering the mouse pointer on the icon displays the Error Text that you set earlier.The Data Grid View control of Windows Forms is a versatile control that can help you create professional-looking data entry forms.The following code example shows how to use this event to validate a row value.The Cell Validating event occurs when a cell is about to commit new content. I designed a Data Grid View under the name "dgv Tarifa" and took a chance on trying Row Validating (tried Validated, Cell Enter, Cell Leave, Row Enter, Row Leave all count same) event. We're a friendly computing community, bustling with knowledgeable members to help solve your tech questions.Please join our friendly community by clicking the button below - it only takes a few seconds and is totally free.

It has the initial "look and feel" of an Excel spreadsheet.

To get notified, you can use the following events exposed by the Rad Grid View control: It is important to know that each one of the validation events is fired only when the user is trying to commit new data in the Rad Grid View control.

They do not occur when the Rad Grid View loads data.

If you want to validate the data cell by cell, the former event is useful where you want to validate the data for the entire row at once then the later event is handy.

In your example, you use the Cell Validating event, as shown below: Here, you want to ensure that the length of the new Customer ID is at least five characters.