Cellvalidating datagridview example

Further, let’s say that you’d like to know as soon as the user has made a change to their selection.

You might want to handle this for a number of reasons: to enable a save button, to change the appearance of selected items, to display a pop-up window, or to check for consistency against other choices.

When you click a Check Box in a Data Grid View Check Box Column, the check marker will update immediately, but Cell Value Changed event on the Data Grid View will not fire until the user happens to click elsewhere and the cell has lost focus. Well, the Data Grid View thinks it’s a little preemptive to go declaring that the cell value has changed while you are still selected on it.

This makes more sense when we think about a Text Box column.

It turns out that this is trickier than it might seem and doesn’t work great out of the box from .

NET, but, not to fear, there are several easy work-arounds that will get the trick done.

I want the numbers to be displayed in numeric format"#,###" (with commas).

If I manually change it and type in 13200 it stays that way, without the comma.

Also, the drop down list will add / remove handlers so you can easily test out which handlers do what without having to specifically comment out lines of code.

I have a Data Grid View which displays numeric (Int32) data from an underlying database.

The full sample code is listed below: Private Sub Form1_Load(By Val sender As System.

Bottom Right End With Hi Ryan, I have written a test sample regarding your scenario, however, I found that once the Data Column type in the datasource is of type "Integer", the Data Grid View will format the data into "#,###" without any problem. Load Dim dt As Data Table = New Data Table("test") dt. Add(New Data Column("column1", Get Type(Integer))) dt. New Row() dr("column1") = i * 1000 dr("column2") = "item" i.

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