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The example below shows how you could replace an existing automatically-generated "Units In Stock" column with a new custom column that supports the Masked Edit feature. Columns("Units In Stock")) ' remove the existing column Data Grid View1. Remove At(index) ' create a new custom column Dim dgv Masked Edit As New Data Grid View Masked Edit Column dgv Masked Edit.

Dim index As Integer ' find the location of the column index = Data Grid View1. Mask = "####" ' this mask will allow only numbers (max of 4) dgv Masked Edit.

' ' Check to see if the user input meets all of the business rules before ' we move on to another row. Data Grid View Cell Cancel Event Args) Handles _ Data Grid View1. Value The error checking discussed in the previous section may not detect "data integrity errors" (those errors where the input violates a database foreign key, unique, or primary key constraint).' Private Sub Data Grid View1_Row Validating(By Val sender As Object, By Val e As _ System. Row Validating ' Assume that text input is complete when you attempt to navigate ' away from the row Data Grid View1. In this case we're just checking to ' see if the Unit Price is a positive number If Data Grid View1. Luckily, the Data Grid View Combo Box Column control was designed to help solve this problem.Click on this triangle to select the data source that was created for you when you ran the Data Source Conversion Wizard. You can use the Error Provider class to display the problems detected during validation.Afterwards, you should have a fully-functional program that will allow you to view the data in the Data Table. When an input error occurs, there will be a little red exclamation point at that cell location.This document is divided into about 5 logical sections starting with a feature and structure overview, followed by an overview of built‑in column and cell types.

Next is an overview of working with data, followed by an overview of specific major features.

The Data Grid View control is the new grid control for Windows Froms 2.0.

It replaces the Data Grid control with an easy to use and extremely customizable grid that supports many of the features that are needed for our customers.

This custom Data Grid View column control is contained in 3 classes...

A Column control that inherits from Data Grid View Column, a Cell control that inherits from Data Grid View Text Box Cell, and an Editing Control that implements the IData Grid View Editing Control interface The Masked Edit Column class is fairly straight forward; it only overrides one property (to ensure that the correct cell type it used).

Let's see what's required to implement a custom column control.