It not only supports data binding but also provides frequently needed column types, such as combo box and button.
Although I would like to understand this better than I do.
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.
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If the value must be numeric, is it possible for you to set the Data Type of the column of your data source to a numeric data type? Until you're familiar with all of the intricacies of ADO. Net book and practice creating your connections, datasets, dataadapters, commands, etc. It makes a lot more sense when you can see and create what's going on behind the scenes.