Rowvalidating

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.

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Is a new row actually in the dataset prior to it being validated?

Delete(); in the rowvalidating event, an error message states that the rownumber does not exist.

What you can do is subscribe to the Data Error event (couldn't see it in the properties, so may need to be done in code.).

Bipin Joshi is the proprietor of Binary Intellect Consulting, where he conducts premier training programs on . He wears many hats, including software consultant, mentor, prolific author, webmaster, Microsoft MVP, and member of ASPInsiders.

現在、Cell Validatingイベントでセルの入力チェックを行っていたのですが、どうやら Cell Validating だけでチェックしたのではダメっぽいです。 たとえば複数列の Data Grid View で全列Null不可の条件かつ登録ボタンを押下すれば、DBに反映するというような場合、新規行のどっかのセルに値を入れて、そのまま登録ボタンを押下すれば、null値がDBに登録されてしまい、DBがnullを許してないため、例外が発生します。 なので、入力チェックは Cell Validating イベントだけでなく、Row Validating も使ってやる必要ありそうです。 Row Validating なら、ここで全セルをチェックしてやればいいだけですからね。 ということで、簡単なサンプルです。 これは、Cell Validating と、Row Validating で入力チェックを行っています。 Row Validating だけでもいいんでしょうが、こまかい制御をかけさせたいという要件もあると思うので Cell Validating でもチェックさせます。 DBにはMDBを、列IDはオートナンバー型なのでここの値の割り振りはJETエンジンに任せてます。 列name1は文字列、列name2は数値型で、両方とも空値は認めません。 Data Setは下記のようなイメージで作ってます。 .

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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.

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