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Let's first set up a mini-application, with a WPF Data Grid displaying a list of instances of a Weather Forecast class.It should look like this: Here's the Weather Forecast class: 1.In your example, you use the Cell Validating event, as shown below: Here, you want to ensure that the length of the new Customer ID is at least five characters.You do this by using the Formatted Value property of the Data Grid View Cell Validating Event Args parameter. Column Index = 3) Then Dim rect2 As Rectangle = Me. Visible = True End If End Sub Private Sub Bkpdwn_D_Data Grid View_Cell Validating(By Val sender As Object, By Val e As System. Data Grid View Cell Validating Event Args) Handles Data Grid View1. Visible = False Else Msg Box("Wrong Date") masked Text Box1.

In this article I will describe two options to implement validation on the cells and rows of a WPF Data Grid.I have a database in Access that I want to display it in a Datagridview which consists of a key, date, time, and 2 more Comboboxes filled again from other tables in the same Access In the date and time fields I've put a mask to be easier to place them. If I change a value in Combobox I have in Datagridview if not the first time the second definitely stop showing the masks in the areas of time and date. The comments are welcomed Table1 ID Col1 Date Time Col4 1 1 08/04/2013 1 2 2 09/04/2013 2 3 3 10/04/2013 3 4 4 11/04/2013 4 5 5 12/04/2013 5 6 6 13/04/2013 6 7 7 14/04/2013 7 Table2 tbl2_ID tbl2_Desc 1 Desc1 2 Desc2 3 Desc3 4 Desc4 5 Desc5 6 Desc6 7 Desc7 Table3 tbl3_ID tbl3_Desc 1 Desc A 2 Desc B 3 Desc C 4 Desc D 5 Desc E 6 Desc F 7 Desc G And the code i use is this Imports System. Ole Db Public Class Form1 Dim con As Ole Db Connection = New Ole Db Connection("Provider=Microsoft. OLEDB.4.0; Persist Security Info=False; Data Source = C:\Test.mdb") Dim cmd As Ole Db Command Dim ds As New Data Set Dim da As Ole Db Data Adapter Dim cmb1 As New Data Grid View Combo Box Column() Dim cmb2 As New Data Grid View Combo Box Column() Private Sub Bkpdwn_D_List_Load(By Val sender As Object, By Val e As System. Load Call fill_cbos() Call fill_data Grid() masked Text Box1 = New Masked Text Box With masked Text Box1 . Visible = False End With masked Text Box2 = New Masked Text Box With masked Text Box2 . Conversely, if not tampered Comboboxes then all the masks and the time and date work fine. How to efectively validate data entry inside a Data Grid View. Late Validation: This validation is performed after the user is done entering data.Well, after doing some research and a bit of trial and error, found out a couple of approaches. For the specific project i was working in, it was the perfect choice.

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