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Datagridview cellvalidating old value
You can validate data by handling the Cell Validating event, which is raised by the Data Grid View when the current cell changes.
In this walkthrough, you will retrieve rows from the column and tries to leave the cell, the Cell Validating event handler will examine new company name string to make sure it is not empty; if the new value is an empty string, the Data Grid View will prevent the user's cursor from leaving the cell until a non-empty string is entered.
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 you display data entry functionality to users, you frequently have to validate the data entered into your form.
The Data Grid View class provides a convenient way to perform validation before data is committed to the data store.
This example is part of a larger example available in Walkthrough: Validating Data in the Windows Forms Data Grid View Control.
If a cell doesn't satisfy some conditions in Cell Validating event, I want the cell's value to be changed to the old value when I leave the cell.
To copy the code in this topic as a single listing, see How to: Validate Data in the Windows Forms Data Grid View Control.
In order to complete this walkthrough, you will need: Data Grid View Binding Source Data Entry in the Windows Forms Data Grid View Control How to: Validate Data in the Windows Forms Data Grid View Control Walkthrough: Handling Errors that Occur During Data Entry in the Windows Forms Data Grid View Control Protecting Connection Information Note The feedback system for this content will be changing soon. If content within a comment thread is important to you, please save a copy.look into the Data Grid View Cell Validating Event Args and the Cell Validating() method of the DGV: Brendon "Roach" VB.NET 2005 2.0 Framework application is using a Data Grid View for SQL data access and user data entry. Error Text property in case it was previously set by a E: System. Cell Validating event handler can clear the error text when the new cell value meets the validation criteria, but when the user reverts to the old cell value by pressing ESC, the E: System. When this event is canceled in data-bound mode, the new value is not pushed to the underlying data source.When this event is canceled in virtual mode, the Cell Value Pushed event will not be raised.The Data Bound Item will be updated only if the cell is validated.However, the user may prefer to validate all the data cells in a row at once.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.