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Datagridview cellvalidating not working

To perform any custom validation on the cell or row being edited, you can use the Cell Validating and Row Validation events, respectively.

This property returns the new value entered in the cell.

If it is less than five characters, you set the Error Text property of that cell to some error message.

Notice how the Column Index and Row Index properties of Data Grid View Cell Validating Event Args parameter are used.

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.

It not only supports data binding but also provides frequently needed column types, such as combo box and button.

The Data Grid View event model is really extensive and one can take control of validation and entry by using many of these events.

Although you used Data Set as the source of your data, you also could have used generic collections if required.

You can download the code that accompanies the article here.

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