business cycle dating - Vb net datagridview cellvalidating change value

SOLUTION To achieve data validation prior the row is committed, you can handle the Cell Validating event, which is raised by the control when the current cell changes or when it goes out of edit mode.Canceling this event prevents the user from exiting the cell until a valid value is entered or the edit process is canceled (via Esc key).

vb net datagridview cellvalidating change value-89

Private Sub dgv Show_Key Press(By Val sender As System.

Key Press Dim sb3 As New String Builder Dim da2 As New Sql Data Adapter For i As Integer = 0 To dgv Show.

This scenario can be achieved by using the Row Validating event, which is fired when the user tries to change the current row (changing to another row or when the control loses focus).

Note that only the Cell Validating event can keep the editor active,when the validation fails and it does not allow the user to exit the cell until a valid value is filled.

But I was surprised to discover that if the cell loses focus (leaves Edit Mode) and then the user clicks back in that cell and changes the value to what it originally was before initially editing it, the cell back color doesn't change back to the default row/cell color. apparently when the cell loses focus, the dataset is changed, so is now the last entered value.

The cell background is being changed when the value is changed. Value) Dim ds Row Index As Integer = Employees Data Set.

To String() Dim entered Value As String = dgv Employees.

Here is where I am comparing the values to determine if the value entered is the same as the original dataset's value: entered Value. To Upper() Then ' Color the edited cell's background dgv Employees.

However, pressing the Esc key in this situation will revert the initial value of the cell and it will close the editor. The Row Validating event has a slightly different behavior.

When the validation fails, the editor is closed, but the user cannot change the current row in the grid until a valid cell value is entered.

I understand that the impact in performance should be irrelevant when using simple validation and conditional highlighting rules but I would as much prefer it not to run useless code everytime the user moves to another cell if it can be avoided.

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