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This example is part of a larger example available in the Virtual Mode reference topic.
Private Sub data Grid View1_Cell Validating(By Val sender As Object, _ By Val e _ As Data Grid View Cell Validating Event Args) _ Handles data Grid View1.
To determine the state of the current cell, use the Row Index and Column Index properties to access the cell through the Data Grid View. When this event is canceled in virtual mode, the Data Grid View.
Use the Formatted Value property to determine the current value. When this event is canceled in data-bound mode, the new value is not pushed to the underlying data source.
The Draw Item event is raised by owner draw controls, such as the List Box and Combo Box controls.
It contains all the information that is needed for the user to paint the specified item, including the item index, the Rectangle, and the Graphics on which the drawing should be done.
The following code example handles the Cell Validating event to ensure that only positive integers are entered by the user. Error Text = "" Dim new Integer As Integer ' Don't try to validate the 'new row' until finished ' editing since there ' is not any point in validating its initial value.
Cell Validating Dim header Text As String = _ data Grid View1.
Text = "Data Grid View validation demo (disallows empty Company Name)" End Sub Private Sub Form1_Load(By Val sender As System. All Cells Except Header) End Sub Private Sub data Grid View1_Cell Validating(By Val sender As Object, _ By Val e As Data Grid View Cell Validating Event Args) _ Handles data Grid View1. Header Text ' Abort validation if cell is not in the Company Name column. Equals("Company Name") Then Return ' Confirm that the cell is not empty.
Reject Changes method is called, any rows still in edit-mode cancel their edits. Modified and deleted rows return back to their original state (Data Row State. You can use the Cell Validating event to check the contents of the cell just before it is committed.
If you don't like it (whatever your validation rules are), you have a few options. The user gets an error icon on the row, and cannot leave the cell.
I have a Data Grid View that is bound to a list of object. There are certain inputs that are not allowed for a row as a whole.