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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.You do this by using the Formatted Value property of the Data Grid View Cell Validating Event Args parameter.
If it is less than five characters, you set the Error Text property of that cell to some error message.
For all sizing enumerations, values with names that refer to displayed cells limit their calculations to cells in displayed rows.
With these values, you can limit which cells are used to calculate the preferred sizes.
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).